remove events and notifications from local plugin create page

Use addTooltip instead of alert

use flexbox instead of fixed positions

change "3box" to "box"

fix modal dialog for provider

Fix browser test

add the debug plugin

Gist list fix

remove colors from icon on vertical panel

Remix Workshop shortcut

Hello ! I made this PR to add my debug plugin, it will help plugin devs debugging their plugins, and remix devs testing the plugin-api !
Also sources are available [here](https://github.com/pldespaigne/remix-debug-plugin) if you want to have a look.