swh-web: Improve page layouts/stylesheets and fix some navigation issues

In order to gain more display space and have a better design and browsing
experience, the following actions have been taken care of:

• fix min-height computation of div.content-wrapper
• remove some bootstrap cards and leverage the use of the top navbar to display the info regarding the type of object currently browsed
• uniformize table stylesheets
• remove some useless borders for a cleaner design
• increase the number of displayed origin search results from 20 to 100
• factorize some html templates
• also fix some navigation issues

Closes T1272