web: Allow hosting multiple projects at the same host.

tissue instances will most often be used with multiple projects. The
trouble of setting up separate DNS entries for each project is just
not worth the trouble. Hence, despite some loss of elegance and
simplicity, we make this concession. With this change, tissue
instances will resemble public-inbox instances in their URL structure.

However, larger projects may wish to keep the entire host to
themselves, particularly for branding reasons. To support such
projects, we must still allow single project hosts.

* tissue/web/server.scm (rebase-uri-path): New function.
(handler): Handle hosts and projects.
* bin/tissue (normalize-project): New function.
(normalize-host, tissue-pull): Adapt to new tissue.conf layout.

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