Adding text/org MIME type to jshttp/mime-db

[Joseph Turner <joseph@ushin.org>]

Hello!

Based on this recent thread, the consensus seems to be that we'd like
the .org file extension to have a dedicated "text/org" MIME type:

https://yhetil.org/orgmode/6d94fff4-4d30-4121-bfd1-f267cb5b637c@gmail.com/

Until the Org syntax spec is complete and a proposal submitted to and
approved by IANA, we can negotiate with downstream MIME libraries to
override "applicaion/vnd.lotus-organizer" with "text/org" on a
case-by-case basis.  As Max Nikulin wrote in the thread linked above,

> An alternative is to negotiate with maintainers of mime.types in
> RedHat and Debian.

Support for "text/org" in <https://github.com/jshttp/mime-db> would let
the Agregore browser (<https://agregore.mauve.moe/>) render Org files.
Then hyperdrive.el users could share Org files to be viewed in Agregore.

John Kitchin opened a PR back in 2017, which was rejected:

https://github.com/jshttp/mime-db/pull/82

After I posted a comment on the thread, the maintainer responded:

> I would suggest opening a new PR.  If you could also include those
> references inline into the description.  Ideally if you could also get
> someone to describe what is implied by "defacto" that would be awesome.

I'd like to open a new PR.  Would you elaborate on "de facto mimetype"?

Thank you!

Joseph