Add a new page describing how we publish to PyPI and how to set up new
projects to be published.

add a first pass at a note on gunicorn tuning

Closes #49

See merge request !34

As noted in #49, we had some useful documentation on gunicorn tuning
hidden away in a comment. We're doing some more investigation work at
the moment on gunicorn so free the existing comment from its prison as a
note so that it can be worked on a bit more.

Closes #49

Update workflow documentation

Closes #35 and uis/devops/uga/administration#29

See merge request !30

copy of updated file from general repo with pr414's key

See merge request !33

webapp-dev-environment: note visibility of secrets repo

Closes #42

See merge request !32

Note that the secrets repo is visible only for uis/devops members. Add a
comment indicating that secrets are also available in our 1password
repository.

Resolve "Remove the "cost involved" comment from the onboarding page"

Closes #41

See merge request !31

Remove comment about cost from the "Add to GitHub organisation" item, and move the item to the main checklist. (#41)
Highlight the difference between GitHub and GitLab to reduce confusion. (#41)

Massively re-work the GitLab section to be accessible to non-technical
team members and to form part of a guide on how product teams can use
GitLab to manage work.

Closes uis/devops/uga/administration#29

HTTPS redirect for readthedocs now works as expected.

Closes #35