rollback AnhTaggableBundle integration

Revert "added AnhTaggableBundle"
Revert "documented requirements; Node.js, Bower, Less"
Revert "add css/js for AnhTaggableBundle to base template, and remove select2 tags init"
Revert "add routing configuration for AnhTaggableBundle"
Revert "add jquery ui dependency (probably not a great idea but whatever, required by Tag-it)"
This reverts commits:
0cf6c8dd8b29970f6d4aee026a064a3d07271326.
b289d7c9d8954eb0ca7e8a63404b0443e9b42885.
ed898da1e33e2ffa533b1a59d91962fb168bd756.
6bc6d1fc1f2ae746396b7b098897ff3138335c63.
c84be465aa8b2b7d1fd0bec6d96ec5f4421830c9.