- Improve Repo methods and fields.
- Bring back documentation redirection on URL fragments.
- Fix hrefs in version map so they point to the SubPath
  and take OldFormat into account.

Center footer.
consistent link tags.
Gettings started styling (text size and padding).

Put phrases in <p>

Add VersionList ([]Version) implementing sort.Interface.
Changed hackedRefs to also return a VersionList holding all valid versions for a repo.
Change Repo struct to hold parts and added methods to construct useful strings from those parts.
Comment out the whole nameHasversion() thingie. It was noted as obsolte made it harder to create clean Repo struct.