Implemented theme switcher (light/dark)

README.md

@@ -6,7 +6,12 @@ Redisign of dmz.rs .
 
 ### TODO:
 
-- create themes switcher
+- [x] create themes switcher
+  - [x] "demo"
+  - [x] propagate to all pages
+  - [x] store theme to localStorage
+  - [x] read "user agent" for default theme
+  - [x] invert images and icons
 - update projects section
 - create blogging system
 - create xmpp bot that connects to events section.