Check documentation for dead links

[Huite]

As a follow up to #1233

It's probably worthwhile to check the generated documentation for dead links.

This might be useful:
https://github.com/lycheeverse/lychee/

It has a github action as well.

[JoerivanEngelen]

Thanks for suggesting lychee, I ran it locally and it found the following. I don't have enough time now to fix it before the release candidate though unfortunately:

  151728/151728 ━━━━━━━━━━━━━━━━━━━━ Finished extracting links                                                                                                                                                   Issues found in 8 inputs. Find details below.0] https://www.usgs.gov/software/modflow-6-usgs-modular-hydrologic-model

[.\html\_static\webpack-macros.html]:
   [ERROR] file:///C:/src/imod-python/docs/_build/html/_static/%7B%7B%20pathto('_static/scripts/pydata-sphinx-theme.js',%201)%20%7D%7D
   [ERROR] file:///C:/src/imod-python/docs/_build/html/_static/%7B%7B%20pathto('_static/styles/pydata-sphinx-theme.css',%201)%20%7D%7D
   [ERROR] file:///C:/src/imod-python/docs/_build/html/_static/%7B%7B%20pathto('_static/scripts/bootstrap.js',%201)%20%7D%7D
   [ERROR] file:///C:/src/imod-python/docs/_build/html/_static/%7B%7B%20pathto('_static/styles/theme.css',%201)%20%7D%7D

[.\html\api\changelog.html]:
     [404] https://deltares.github.io/imod-python/user_guide/regridding.html
 [TIMEOUT] https://imod.xyz/

[.\html\examples\mf6\ex01_twri.html]:
     [404] https://github.com/MODFLOW-USGS/modflow6-examples/tree/master/notebooks/ex-gwf-twri.ipynb

[.\html\developing\releasing.html]:
     [401] https://dpcbuild.deltares.nl/
     [401] https://dpcbuild.deltares.nl/buildConfiguration/iMOD6_IMODPython_Windows_DeployAll?mode=builds

[.\html\examples\imod-wq\Elder.html]:
     [404] http://www.eng.auburn.edu/~clemept/publsihed_pdf/awrmat.pdf

[.\html\api\generated\select\imod.select.cross_section_line.html]:
     [404] https://github.com/Unidata/MetPy/blob/master/metpy/interpolate/slices.py

[.\html\api\generated\select\imod.select.cross_section_linestring.html]:
     [404] https://github.com/Unidata/MetPy/blob/master/metpy/interpolate/slices.py

[.\html\examples\imod-wq\Hydrocoin.html]:
     [403] https://doi.org/10.1029/97WR01926