ENH: write markup-help.html from scratch using tables
ENH: copyrights info move from footer to rightsidebar bottom
ENH: remove btn-block class in all buttons of site

Apart from removing btn-block,
1. float submit button to right in new-item.html
ENH: clean unwanted code in html and css files

Changes to note:
1) remove .container custom width of 80% --uses default bootstrap width

Others:
1) remove all unwanted divs
2) remove unwanted css and replace with better settings
ENH: add exception handling on image upload view
ENH: change searchbar class name and increase height

Note:
The class name of searchbar .spc-header-searchbar is changed to .spc-searchbar
since its no longer lives in header