Also: on default home page, don't show the big green Join button
if the user is logged in; they're presumably running BOINC
on at least one computer.
However, in this case put a Join item in the Project menu
in case this is a new computer and they forgot where to download from.
- make selects 240px wide (kludge)
- in navbar, link user name to home page
- add Project to navbar, more Your Account there
- add maximum-scale to <meta>
- change default home page to replace text with a Join button,
which links to a new page saying how to join.
- change default to show image to top of home page
- add form-control class to all <select>s so that text displays
correctly with dark-background themes
- change args to page_head():
- add $is_main; gets passed to project_banner()
- remove $title_plain; not sure what it was for
- add arg for inverse navbar