repobrowse: redirect w/o trailing slashes for humans

For human-visible HTML pages, avoid the trailing slash as that
can reduce cache hits in both the server (using varnish) and
clients.  Typical web browsers are all capable of following
301 redirects without difficulty or human interaction.

We do not redirect for endpoints which may be consumed by
automated tools as that may cause compatibility problems.  For
example, curl(1) does not automatically follow redirects and
needs the "-L" flag to do so.

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