set up base template

- set up top nav
  - auto generate menu from `main`
  - configurable brand (can be hidden or custom, defaults to site title)
  - top nav can be configured to be sticky
- css in top, js at the end of body
- default google analitycs template added to base
- added highlight.js

layouts/partials/title.html

@@ -0,0 +1 @@
+<title>{{ if .IsHome }}{{ .Title }}{{ else }}{{ .Title }} - {{ .Site.Title }}{{ end }}</title>