Add Schism Changelog && Cleanup

Removed mGerrit since well we don't have gerrit lol
Clean up for some labels because they aren't named properly
More things to come for Changelog as we plan to include the external/changeloglib soon
Hopefully we get a OTA app soon as well so we can add the links here

Signed-off-by: Chintan Shah <cgintan1998@gmail.com>