Always check if README exists in choose_readme()

Specifying a nonexistent README file via the readme option is sometimes
useful, e.g. when using scan-path and setting a global default.
Currently, we check whether there is only one option in the readme
option and, if so, we choose that file without checking whether it
exists. As a consequence, all repositories are equipped with an about
link in the aforementioned scenario, even if there is no about file.
Remove the early check for the number of keys and always check whether
the file exists instead.

Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>
git: update to v2.0.4

No CGit changes required.

Signed-off-by: John Keeping <john@keeping.me.uk>
Extract clone URL printing to ui-shared.c

This will allow us to reuse the same logic to add clone URL <link/>
elements to the header of all repo-specific pages in order to support
the rel-vcs microformat.

Signed-off-by: John Keeping <john@keeping.me.uk>
ui-summary: add "rel='vcs-git'" to clone URL links

This is described in the rel-vcs microformat[1].

[1] https://joeyh.name/rfc/rel-vcs/

Signed-off-by: John Keeping <john@keeping.me.uk>
ui-shared: add rel-vcs microformat links to HTML header

As described at https://joeyh.name/rfc/rel-vcs/.

Signed-off-by: John Keeping <john@keeping.me.uk>