radicle-explorer: init at 0.17.0

This commit adds radicle-explorer, a web interface for Radicle which displays
repositories, issues and patches.

The package builds the web interface itself, but a web server still needs to be
configured to serve it. This is out-of-scope for this commit, but may be added
to the related NixOS modules in the future.

The web interface is based on the API exposed by radicle-httpd. For this reason
the sources and version of the web interface have been tied directly to the
radicle-httpd package, necessitating corresponding updates on this package
whenever httpd is updated.

There's a little bit of fixed-point magic in this change to enable two features:

* Overriding build-time configuration (required to, for example, display a
  different Radicle seed by default). Documentation for this is available in the
  upstream repo.

* Building radicle-explorer without plausible, a web tracking package which
  sends user-data to a remote host by default.

These are configured through slightly different overriding mechanisms, but I
hope to simplify this in the future with some upstream patches.

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