Move wiki to repo + Automated updating of wiki

[marc-vdm]

What

• Moves the wiki to this repo
• Adds script to push changes to the activity_browser/docs/wiki folder to the wiki git
• Script can be run 2 ways:
  1. when a release is done
     • e.g. for new text related to a new feature release, which should only be visible when the feature is available
  2. or can be manually triggered with manual_update_wiki.yml
     • e.g. for fixing typos or making existing text clearer
• Only actually pushes changes when changes have been made.

Why

• To finally start keeping documentation up to date
• To manage documentation from the same place as AB is found,
  • Allows changes to documentation to be tracked in same PR as changes to features
• To automatically update documentation when new versions of AB come out with new documentation
  • Only triggers on release so documentation will be up to date with current release
  • Downside is that this means documentation can only be changed with new releases
• To manually change documentation when needed
• Docs stored in activity-browser/activity_browser so documentation is shipped with new releases, allowing us to add the full wiki to UI at some point.

Checklist

• Keep pull requests small so they can be easily reviewed.
• Update the documentation, please follow the numpy style guide.
• Update tests.
• Categorize the PR by setting a good title and adding one of the labels:
  bug, feature, ui, change, documentation, breaking, ci
  as they show up in the changelog.
• Link this PR to related issues by using closing keywords.
• Add a milestone to the PR (and related issues, if any) for the intended release.
• Request a review from another developer.

Resolves #410

[coveralls]

coverage: 54.099% (-0.03%) from 54.132%
when pulling 29079a4 on marc-vdm:documentation
into 132bd48 on LCA-ActivityBrowser:main.