spacemacs-navigation layer

Description

This layer adds general navigation functions to all supported layers.

Support for ace-links in
- spacemacs buffer
- info-mode
- help-mode
- eww-mode
Support for keeping the cursor centered on the screen
Evilified version of doc-view-mode
Tweaks for golden-ratio-mode
Support for paradox a modern emacs package manager
Shortcuts for restarting emacs
Shortcuts for easily switching between windows