Removed obsolete references to branding and skins.

Author: longsleep

README.md

@@ -108,20 +108,6 @@ The latest version of Spreed WebRTC can be found on GitHub:
   and CSS reload directly.
 
 
-## Branding
-
-  Insert logo in `static/img`. Edit `src/styles/global/_branding.scss` to link
-  to desired custom logo. It is also possible to insert the raw svg data.
-
-
-## Skins
-
-  Insert skins in `src/styles/global/skins` and edit the `@import "skins/light";`
-  line in `src/styles/global/_variables.scss`. Available skins are light and
-  dark. It is recommended to create a new skin file if you wish to customize
-  colors.
-
-
 ## Running for production
 
   Spreed WebRTC should be run through a SSL frontend proxy with