Now includes all the template hooks in the page, and a detailed
example for the common case of adding an "about" page.

These templates add content to the top navbar
and to the repository page.
This way we do not have to copy and modify the whole
template, and re-modify it after upgrading Gitea if
it changes.

Signed-off-by: Alberto González Palomo <bugs@sentido-labs.com>

* Clean up spelling, grammar, perspective, whitespace, language, markup, etc.

* Update gitea version on docs/install-from-binary

* Update all versions

* Add missing indexer doc in configuration

* Unify MAX_FILE_SIZE to 1024 * 1024

* Add defaults to config cheatsheet, and clean up document.

* Updates and touchups, per review.

* support default private when creating or migrating repository

* fix fmt

* use string constants on repository default private in app.ini

* fix fmt

Include defaults in cheat sheet, for that section

original PR go-gitea/docs#147 and author @0xbaadf00d

Now that 1.3 is out time tracking is a new feature
go-gitea/docs#148

* import docs into main repository

Signed-off-by: Matti Ranta <matti@mdranta.net>