Majorly re-organize modules

- Split large modules into smaller parts (e.g. siren-text-manipulation)
- Organize modules into high level groups:
  - completion
  - core
  - editor
  - languages
  - linting
  - misc
  - navigation
  - projects
  - spelling
  - text-editing
  - version-control
  - windows
  - workspaces

modules/version-control/siren-github.el

@@ -0,0 +1,13 @@
+;;; siren-github.el --- jimeh's Emacs Siren: Github related stuff.
+
+;;; Commentary:
+
+;; Basic configuration for various Github related packages.
+
+;;; Code:
+
+(use-package github-browse-file
+  :defer t)
+
+(provide 'siren-github)
+;;; siren-github.el ends here