Documentation site missing

[linear[bot]]

We need to develop a documentation site

[stuartmaxwell]

Notes:

• Docs site set up here: https://stuartmaxwell.github.io/djpress/
• Docs are located in the docs directory
• A Sphinx build system has been set up in the docs directory
• The published HTML files are stored in docs/_build - a gitignore rule excludes this from being checked in
• And finally a GitHub action docs.yaml builds and publishes the docs on push to main