meta: decharter the http working group

Fixes: https://github.com/nodejs/CTC/issues/41

PR-URL: https://github.com/nodejs/node/pull/10604
Fixes: https://github.com/nodejs/CTC#41


Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Michal Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>