Clean up linkcheck excludes

[melissalinkert]

Fixes ome/ome-model#156. Can re-add any of these if the build ends up failing.

Note that the only reference to http://www.definiens.com is also removed, as I don't think it makes sense to keep a broken link for something that's permanently gone. https://web.archive.org/web/20190927000502/https://www.definiens.com/ is I believe the last valid archive page. Happy to follow some other approach, but this is sort of the same problem as ome/bio-formats-documentation#409.

[sbesson]

From the HEAD of this PR I have

(venv) sbesson@Sebastiens-MacBook-Pro-3 ome-model-documentation % make html linkcheck | grep broken
(  ome-tiff/index: line   63) broken    http://www.cellimagelibrary.org/ - HTTPSConnectionPool(host='www.cellimagelibrary.org', port=443): Max retries exceeded with url: / (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1006)')))
(   ome-tiff/data: line   28) broken    https://eliceirilab.org/software/wiscscan/ - 404 Client Error: Not Found for url: https://eliceirilab.org/software/wiscscan/
(   ome-tiff/code: line   68) broken    https://www.awaresystems.be/imaging/tiff/bigtiff.html - 404 Client Error: Not Found for url: https://www.awaresystems.be/imaging/tiff/bigtiff.html
(  ome-tiff/tools: line   27) broken    https://imagej.nih.gov/ij/ - 404 Client Error: Not Found for url: https://imagej.nih.gov/ij/
(  ome-tiff/index: line   45) broken    https://www.cytivalifesciences.com/ - 403 Client Error: Forbidden for url: https://www.cytivalifesciences.com/
(  ome-tiff/index: line   44) broken    https://www.zeiss.com/microscopy/int/home.html - 404 Client Error: Not Found for url: https://www.zeiss.com/microscopy/int/home.html
make: *** [linkcheck] Error 1

Are these builds running anywhere since the documentation has been extracted to this repository @jburel ? Or is the linkcheck expected to be executed as part of the GitHub workflow (currently disabled)?

[melissalinkert]

Note changes to awaresystems links are in line with ome/bio-formats-documentation#387.

[sbesson]

@jburel what is the deployment strategy for this documentation? I see https://github.com/ome/ome-model-documentation/releases/tag/2023.06.29 was pushed as of the migration. Is https://ome-model.readthedocs.io/en/stable/index.html updated on tag builds? And should the tags follow a calendar versioning scheme?