browse: Use shorter urls for origin context views

Promote the use of following urls /browse/origin/(origin_url)/...
instead of /browse/origin/(origin_type)/url/(origin_url)/... in browse.

In a same manner, to provide origin context through query parameters,
simply use <url>?origin=(origin_url) instead of
<url>?origin_type=(origin_type)&origin_url=(origin_url)