Fix/tweak blocking page

* fix favicon
* add meta charset
* add html lang
* add a page title
* remove unneeded html end tags
* fix viewport tag to allow zooming
* compress the "blocked by Pi-hole" SVG
* remove trailing spaces
* switch to double colon pseudo elements (works from IE9 and newer)
* add missing vendor prefixes
* other minor tweaks
* add `Access-Control-Allow-Origin` header to all font types

Signed-off-by: XhmikosR <xhmikosr@gmail.com>

advanced/lighttpd.conf.fedora

@@ -2,7 +2,7 @@
 # (c) 2017 Pi-hole, LLC (https://pi-hole.net)
 # Network-wide ad blocking via your own hardware.
 #
-# lighttpd config for Pi-hole
+# Lighttpd config for Pi-hole
 #
 # This file is copyright under the latest version of the EUPL.
 # Please see LICENSE file for your rights under this license.
@@ -78,7 +78,7 @@ $HTTP["url"] =~ "^/admin/" {
         "X-Frame-Options" => "DENY"
     )
 
-    $HTTP["url"] =~ ".ttf$" {
+    $HTTP["url"] =~ "\.(eot|otf|tt[cf]|woff2?)$" {
         # Allow Block Page access to local fonts
         setenv.add-response-header = ( "Access-Control-Allow-Origin" => "*" )
     }