make html returns error due to conflicting Sphinx version specification in requirements.txt

[mmdurrant]

Environment:
Python 3.10
Windows 10
Git commit hash 41df438

Running the installation directions as specified resulted in:

Running Sphinx v4.4.0

Sphinx version error:
The sphinxcontrib.applehelp extension used by this project needs at least Sphinx v5.0; it therefore cannot be built with this version.```

----- 

Changing the requirements.txt to specify `sphinx>=5.0` resulted in the following... 

```D:\Projects\_ESC\after-effects-plugin-guide>cat requirements.txt
sphinx>=5.0.0
sphinx_rtd_theme
sphinx_rtd_dark_mode
docutils<0.18

D:\Projects\_ESC\after-effects-plugin-guide>pip install -r requirements.txt
Collecting sphinx>=5.0
  Downloading sphinx-7.2.6-py3-none-any.whl (3.2 MB)
     ---------------------------------------- 3.2/3.2 MB 1.3 MB/s eta 0:00:00
Requirement already satisfied: sphinx_rtd_theme in c:\python310\lib\site-packages (from -r requirements.txt (line 2)) (1.3.0)
Requirement already satisfied: sphinx_rtd_dark_mode in c:\python310\lib\site-packages (from -r requirements.txt (line 3)) (1.3.0)
Requirement already satisfied: docutils<0.18 in c:\python310\lib\site-packages (from -r requirements.txt (line 4)) (0.17.1)
Requirement already satisfied: sphinxcontrib-htmlhelp>=2.0.0 in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (2.0.5)
Requirement already satisfied: sphinxcontrib-qthelp in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (1.0.7)
Requirement already satisfied: snowballstemmer>=2.0 in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (2.2.0)
Requirement already satisfied: sphinxcontrib-serializinghtml>=1.1.9 in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (1.1.10)
Requirement already satisfied: Pygments>=2.14 in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (2.17.2)
  Downloading sphinx-7.2.5-py3-none-any.whl (3.2 MB)
     ---------------------------------------- 3.2/3.2 MB 1.7 MB/s eta 0:00:00
  Downloading sphinx-7.2.4-py3-none-any.whl (3.2 MB)
     ---------------------------------------- 3.2/3.2 MB 1.8 MB/s eta 0:00:00
  Downloading sphinx-7.2.3-py3-none-any.whl (3.2 MB)
     ---------------------------------------- 3.2/3.2 MB 2.0 MB/s eta 0:00:00
  Downloading sphinx-7.2.2-py3-none-any.whl (3.2 MB)
     ---------------------------------------- 3.2/3.2 MB 2.0 MB/s eta 0:00:00
  Downloading sphinx-7.2.1-py3-none-any.whl (3.2 MB)
     ---------------------------------------- 3.2/3.2 MB 2.0 MB/s eta 0:00:00
  Downloading sphinx-7.2.0-py3-none-any.whl (3.2 MB)
     ---------------------------------------- 3.2/3.2 MB 1.0 MB/s eta 0:00:00
  Downloading sphinx-7.1.2-py3-none-any.whl (3.2 MB)
     ---------------------------------------- 3.2/3.2 MB 1.6 MB/s eta 0:00:00
  Downloading sphinx-7.1.1-py3-none-any.whl (3.2 MB)
     ---------------------------------------- 3.2/3.2 MB 1.6 MB/s eta 0:00:00
  Downloading sphinx-7.1.0-py3-none-any.whl (3.2 MB)
     ---------------------------------------- 3.2/3.2 MB 2.4 MB/s eta 0:00:00
  Downloading sphinx-7.0.1-py3-none-any.whl (3.0 MB)
     ---------------------------------------- 3.0/3.0 MB 1.8 MB/s eta 0:00:00
  Downloading sphinx-7.0.0-py3-none-any.whl (3.0 MB)
     ---------------------------------------- 3.0/3.0 MB 2.3 MB/s eta 0:00:00
Requirement already satisfied: babel>=2.9 in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (2.14.0)
Requirement already satisfied: packaging>=21.0 in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (23.2)
Requirement already satisfied: colorama>=0.4.5 in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (0.4.6)
Requirement already satisfied: sphinxcontrib-jsmath in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (1.0.1)
Requirement already satisfied: sphinxcontrib-applehelp in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (1.0.8)
Requirement already satisfied: Jinja2>=3.0 in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (3.1.3)
Requirement already satisfied: alabaster<0.8,>=0.7 in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (0.7.16)
Requirement already satisfied: requests>=2.25.0 in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (2.31.0)
Requirement already satisfied: imagesize>=1.3 in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (1.4.1)
  Downloading sphinx-6.2.1-py3-none-any.whl (3.0 MB)
     ---------------------------------------- 3.0/3.0 MB 2.4 MB/s eta 0:00:00
  Downloading sphinx-6.2.0-py3-none-any.whl (3.0 MB)
     ---------------------------------------- 3.0/3.0 MB 1.7 MB/s eta 0:00:00
  Downloading sphinx-6.1.3-py3-none-any.whl (3.0 MB)
     ---------------------------------------- 3.0/3.0 MB 2.0 MB/s eta 0:00:00
  Downloading sphinx-6.1.2-py3-none-any.whl (3.0 MB)
     ---------------------------------------- 3.0/3.0 MB 2.1 MB/s eta 0:00:00
  Downloading sphinx-6.1.1-py3-none-any.whl (3.0 MB)
     ---------------------------------------- 3.0/3.0 MB 2.5 MB/s eta 0:00:00
  Downloading sphinx-6.1.0-py3-none-any.whl (3.0 MB)
     ---------------------------------------- 3.0/3.0 MB 2.1 MB/s eta 0:00:00
  Downloading sphinx-6.0.1-py3-none-any.whl (3.0 MB)
     ---------------------------------------- 3.0/3.0 MB 1.0 MB/s eta 0:00:00
  Downloading sphinx-6.0.0-py3-none-any.whl (3.0 MB)
     ---------------------------------------- 3.0/3.0 MB 593.4 kB/s eta 0:00:00
  Downloading sphinx-5.3.0-py3-none-any.whl (3.2 MB)
     ---------------------------------------- 3.2/3.2 MB 1.2 MB/s eta 0:00:00
Requirement already satisfied: sphinxcontrib-devhelp in c:\python310\lib\site-packages (from sphinx>=5.0->-r requirements.txt (line 1)) (1.0.6)
Requirement already satisfied: sphinxcontrib-jquery<5,>=4 in c:\python310\lib\site-packages (from sphinx_rtd_theme->-r requirements.txt (line 2)) (4.1)
Requirement already satisfied: MarkupSafe>=2.0 in c:\python310\lib\site-packages (from Jinja2>=3.0->sphinx>=5.0->-r requirements.txt (line 1)) (2.1.4)
Requirement already satisfied: idna<4,>=2.5 in c:\python310\lib\site-packages (from requests>=2.25.0->sphinx>=5.0->-r requirements.txt (line 1)) (3.6)
Requirement already satisfied: certifi>=2017.4.17 in c:\python310\lib\site-packages (from requests>=2.25.0->sphinx>=5.0->-r requirements.txt (line 1)) (2023.11.17)
Requirement already satisfied: urllib3<3,>=1.21.1 in c:\python310\lib\site-packages (from requests>=2.25.0->sphinx>=5.0->-r requirements.txt (line 1)) (2.2.0)
Requirement already satisfied: charset-normalizer<4,>=2 in c:\python310\lib\site-packages (from requests>=2.25.0->sphinx>=5.0->-r requirements.txt (line 1)) (3.3.2)
Installing collected packages: sphinx
  Attempting uninstall: sphinx
    Found existing installation: Sphinx 4.4.0
    Uninstalling Sphinx-4.4.0:
      Successfully uninstalled Sphinx-4.4.0
Successfully installed sphinx-5.3.0

[notice] A new release of pip available: 22.2.2 -> 23.3.2
[notice] To update, run: python.exe -m pip install --upgrade pip```

I'm submitting a followup PR to fix the requirements.txt but wanted to make sure I documented the issue so you had context.