Add readthedocs for everest

[oyvindeide]

Issue
Related to #8806

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[frode-aarstad]

Has there been a change in the config on the read_the_docs account aswell?

[oyvindeide]

Has there been a change in the config on the read_the_docs account aswell?

Yes, I have updated the account, it but requires that this file is merged before I can check that it works.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.71%. Comparing base (c4e1365) to head (7e700c2).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9074      +/-   ##
==========================================
- Coverage   90.72%   90.71%   -0.02%     
==========================================
  Files         350      350              
  Lines       21783    21783              
==========================================
- Hits        19763    19760       -3     
- Misses       2020     2023       +3     

Flag	Coverage Δ
cli-tests	39.02% <ø> (+0.01%)	⬆️
gui-tests	71.70% <ø> (+0.02%)	⬆️
performance-tests	49.27% <ø> (+0.02%)	⬆️
unit-tests	79.55% <ø> (-0.04%)	⬇️

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