These fix problems encountered when switching to the new Hugo which has
a completely different markdown engine. I went through diffs of the generated
HTML and made required adjustments.
- Fix a bunch of heading capitalization.
- Remove words that shouldn't be in the dictionary
and update the text accordingly.
- Added a few @@ sequences to reference content files from text blocks.
- Used a few {{< source_branch_name >}} sequences to refer to the proper
branch in GitHub rather than master.