Fixing link for options page info

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>
Merge branch 'master' of https://github.com/operasoftware/extension-docs
Added 'Red Look' to extensions docs

Signed-off-by: Shwetank Dixit <emailshwetank@gmail.com>
Merge pull request #35 from shwetank/master

Added 'Red Look' to extension docs (Also fixed a link in manifest file)