Fix Read The Docs config file.

[fedejaure]

Expected Behavior

The read the docs build process should work correctly with the provided config file.

Actual Behavior

The read the docs build process is broken due to improper configuration in the config file.

Fix .readthedocs.yml:

version: 2

build:
  os: ubuntu-22.04
  tools:
    python: "3.8"

formats: all

sphinx:
  configuration: docs/conf.py

python:
  install:
    - requirements: docs/requirements.txt
    - method: pip
      path: .