Docs redesign (#728)

* Adding a dark mode
* Adding reference for types to summary pages
* Adding API Reference
* Adding modifiers to methods/fields/etc
* Minimizing files input
* Caching a lot of the output pages
* Cache only for each execution
* Adding API references to existing docs

docs/input/appendix/index.cshtml

@@ -1,7 +1,6 @@
 Title: Appendix
 Order: 100
 ---
-
 <h1>Sections</h1>
 
 <ul>