web: Introduce <file> objects for web export.

With <file> objects specifying the files to export to the web, the
user has ultimate flexibility in their choice of what to export and
how to export.

* bin/tissue (tissue-web): Parameterize %project-name and
%tags-path. Use new signature of build-website.
* tissue/tissue.scm: Import (srfi srfi-1) and (srfi srfi-71).
(<tissue-configuration>)[web-files]: New field.
(tissue-configuration-web-files): New public function.
(tissue-configuration): New macro.
* tissue/web.scm: Import (srfi srfi-9).
(%project-name): New public parameter.
(<file>): New type.
(build-issue-listing): Delete function.
(copier, gemtext-reader, gemtext-exporter, skribe-exporter,
tag-issue-lister, tag-pages): New public functions.
(exporter, with-current-directory): New functions.
(build-website): Simply write <file> objects to files.
(replace-extension): Export.

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