Sass support + layout/css cleanup

-Add sass support (Replace style.css with style.scss; add new sass_theme_reader.sh script; add sass:compile to package.json; add new dependencies for sass; compiled style.css is now minified)
-Claim address improvements (Better instructions; better error msgs)
-Fix for disappearing Network > Connections table
-Tons of layout and css fixes and tweaks (Improved mobile support)
-Remove old Exor theme

scripts/sass_theme_reader.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+echo "\$theme-name: \"$(./node_modules/.bin/strip-json-comments settings.json | ./node_modules/.bin/json theme)\";" > ./public/stylesheets/_theme-selector.scss