[Hinode] Add top level pages

[timcappalli]

The top level pages for docs all 404

/docs/reference/
/docs/use-cases/
etc

[timcappalli]

A very quick and dirty fix was added in #414

Need to fix a few things:

• Add sidebar
• Use weight instead of alphabetical order
• Figure out why the footer isn't sticking to the bottom
• Do something nicer with the cards (e.g. not edge to edge)