Authentication start
Updated bullet points 7 and 8
Fix missing space when adding a CSS class
Open page ToC for the page content, and not for the whole toc-root
Replace curly apostrophe ’ with straight single quote '

Excepts on a chrono: 12’57”
Fix double encoding in page ToC

The Makefile `--attribute encoding=utf-8` was not needed,
but I'm sure it won't harm.
Fix link to self page: use # to prevent page reload
Much to Many Bullet Point 8
42 delete have to.
52 made friend plural
53 made friend plural.
59 made players singular.
63 deleted cool.
Support external links as section-link
External links to SDK code and reference
Delete your to make it more clear
Delete involve and add regarding how, specific
Delete his add their, gender neutral
Much to many, proper tense
Act to acted