Update the docs/conf.py file to fix the docs build

[ajitdsa]

Description

The docs build is broken in opsdroid workflows.
See here: https://readthedocs.org/projects/opsdroid/builds/14715423/

I used the following to fix the issue:
https://www.sphinx-doc.org/en/master/usage/extensions/autodoc.html#confval-autodoc_mock_imports

Status

READY

Type of change

• Documentation (fix or adds documentation)

How Has This Been Tested?

This has been tested in the ci and succeeds now:
https://readthedocs.org/projects/opsdroid/builds/14716702/

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

Merging #1830 (1de4c28) into master (e806de3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1830   +/-   ##
=======================================
  Coverage   99.33%   99.33%           
=======================================
  Files          80       80           
  Lines        4817     4817           
=======================================
  Hits         4785     4785           
  Misses         32       32           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e806de3...1de4c28. Read the comment docs.

[jacobtomlinson]

Awesome!