Add pre-commit.

Update build script to push on main branch.

Upgrade fs2 version.

Content: Split out diagrams.

Remove redundant css.

Merge all styles into one file.

Remove main.css file.

Refactor book-title.

Reverse icon colours and clean up.

Move latest chapter to the top.

Delete unnecessary file.

Ignore generated font files.

Remove kalam.

Correct favicon instructions.

Add reveal local.

Add calendar-month icon.

Update README with org only and correct instructions for snippets.

Add a doctype onto everything.

Raise error if page has not been added to the ptree.

Style site for mobile.