Add sphinx_rtd_theme to docs dependencies

[will-moore]

Try to fix sphinx readthedocs build - similar to:
ome/omero-scripts@07e130d

[will-moore]

@jburel Thanks for the pointer. Not sure if I've applied it wrong (I have docs/source/conf.py instead of docs/conf.py) or if that error needs a different fix?

[jburel]

you will need to declare it in the .readthedocs.yml file
i.e.

python:
  install:
    - requirements: docs/source/requirements.txt

[jburel]

It did not install it

[will-moore]

@jburel The error you had at ome/omero-scripts#187
https://github.com/ome/omero-scripts/actions/runs/5925626167/job/16065416934
was

Extension error:
Could not import extension sphinx_rtd_theme (exception: No module named 'sphinx_rtd_theme')

whereas I'm seeing

Traceback (most recent call last):
  File "/home/docs/checkouts/readthedocs.org/user_builds/ome-zarr/envs/301/lib/python3.9/site-packages/sphinx/config.py", line 350, in eval_config_file
    exec(code, namespace)
  File "/home/docs/checkouts/readthedocs.org/user_builds/ome-zarr/checkouts/301/docs/source/conf.py", line 85, in <module>
    'html_theme': html_theme,
NameError: name 'html_theme' is not defined

at https://readthedocs.org/projects/ome-zarr/builds/21717507/

Also noticed that one of those jobs is github actions, the other is on readthedocs...

[jburel]

I will avoid using an rc
you don't need it here

[will-moore]

Hah, got there in the end!
Please merge if OK as this is failing on all PRs just now

[will-moore]

@joshmoore / @jburel OK to merge?

[jburel]

Why did you pick the rc?

[will-moore]

See 492b29c - I copied a template (link in the commit)

[jburel]

but you don't need the rc to get it to work

[will-moore]

I wasn't taking any chances!
But OK, removed the rc now.

[will-moore]

@jburel - Green again - good to merge (since other PRs have failing builds just now)?

[jburel]

Thanks