ENH: change submission Form from POST to GET

1. spc-new-submission url takes item_type as extra paramenter
This is required for GET requests

2. POST is converted to GET to fix dropdown menu of submit button on
header
ENH: change submission form heading dynamically
ENH: show profile summary as table
ENH: increase searchbar width
ENH: redesign profile dropdown menu
ENH: add top contributors list to rightsidebar
ENH: add top tags list to rightsidebar
ENH: show submission summary as table in item.html

1. previously dl is used and in wrong way (to just condense it)
2. Since, tables offer better compatibility, table has been choosed.
ENH: display submission type with image

1. one-person-result.html, one-search-result.html contains totally new code.
2. edit in remaining html pages are done to fit the above pages code
3. unnecessary css definitions are removed in .less (.css is compiled)
ENH: move image upload form to rightsidebar

Reasons:
Looks out of world below the submission form in new-item.html.

Future:
Currently we rely on Restructured Text. Can probably use PageDown but need to shift to Markdown format.
MAINT: improve image upload message
BUG: add media_root for image uploads in debug mode

1. in debug=true mode, images don't get uploaded unless media root is present