Introduce rst linting via precommit hook

[AlpAribal]

Description

Adds the doc8 precommit hook to lint rst files and fixes warnings it produces.

Also removes terraform and sqlfluff precommit hooks, since there are no terraform or sql files in the repo.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring including code style reformatting
• Other (please describe):

Checklist:

• I have read the contributing guideline doc (external contributors only)
• Lint and unit tests pass locally with my changes
• I have kept the PR small so that it can be easily reviewed
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• All dependency changes have been reflected in the pip requirement files.

[AlirezaSohofi]

This is great, thanks a lot Alp!

[AlirezaSohofi]

👍