Integrated list managment with admin site

- Made favicon work across pages
- No longer needs root access to tee command, still needs root access for gravity.sh and whitelist.sh
- Added call to gravity.sh when you remove an item
- Moved header and footer into separate files
- Moved files from list into the main folder
- Got rid of extra dependencies from the old list setup
- Added home button to sidebar
- Renamed original whitelist to "Old Whitelist"
- Added buttons to sidebar for Whitelist and Blacklist

php/add.php

@@ -0,0 +1,10 @@
+<?php
+if(!isset($_GET['domain'], $_GET['list']))
+    return;
+
+if($_GET['list'] == "white")
+    exec("/usr/local/bin/whitelist.sh ${_GET['domain']}");
+else {
+    exec("echo '${_GET['domain']}' >> /etc/pihole/blacklist.txt");
+    exec("sudo /usr/local/bin/gravity.sh");
+}