Commit Briefs
correction: QUERY_STRING is *not* urldecoded.
RFC3875 § 4.1.7 states that "the QUERY_STRING variable contains a URL-encoded search or parameter string".
document the implicit mapping for text/gemini
and remove the explicit mapping from the documentation and test files.
add an entry for text/gemini in the `types' example
if using `types' the internal listing is not used, so show how to add the entries for text/gemini when using /usr/share/misc/mime.types.