Hybrid core update, integrate new functions

Signed-off-by: M.Satrya <satryabima24@gmail.com>
1. Update Docs
2. Remove automatically add image to the post content when choosing post format image
3. Fix wrong font-family in site descriptions
update docs and descriptions

Signed-off-by: M.Satrya <satryabima24@gmail.com>
Merge remote-tracking branch 'remotes/origin/1.8'