docs: fix Read the Docs config

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.21%. Comparing base (d1738c8) to head (5d43c09).

:exclamation: Current head 5d43c09 differs from pull request most recent head 76a8fa4

Please upload reports for the commit 76a8fa4 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #188 +/- ## ======================================= Coverage 98.21% 98.21% ======================================= Files 8 8 Lines 561 561 ======================================= Hits 551 551 Misses 10 10 ``` | [Flag](https://app.codecov.io/gh/elixir-cloud-aai/TESK/pull/188/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-cloud-aai) | Coverage Δ | | |---|---|---| | [test_unit](https://app.codecov.io/gh/elixir-cloud-aai/TESK/pull/188/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-cloud-aai) | `98.21% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=elixir-cloud-aai#carryforward-flags-in-the-pull-request-comment) to find out more.

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