Feature/docs basic entries (#124)

* Re-arranged basic docs, added configuration page

* Altered ordering of pages

* Added changelog to docs

* Added about header to index

* Removed reference to code base

* Added quote type to docs config

* Made configuration docs into a directory

* Added HSTS and X-Frame-Options docs

* Added empty CSP docs file

* Added docs for the  X-Content-Type-Options header

* Added docs for the X-XSS-Protection header

* Linked to the CSP header docs in the X-Frame-Options header

* Fixed layout types on header config docs

* Fixed layout for CSP header config page

docs/configuration/Content-Security-Policy.md

@@ -1,6 +1,7 @@
 ---
 title: Content-Security-Policy
 nav_order: 5
+layout: page
 ---
 
 The Mozilla Developer Network describes the X-XSS-Protection header like this: