help: Apply heading CSS beyond just h1 headings.
help: Apply heading CSS beyond just h1 headings.

This makes it possible to use non-H1 headings in the sidebars.

eeshangarg/zulip,eeshangarg/zulip,kou/zulip,andersk/zulip,zulip/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,andersk/zulip,rht/zulip,eeshangarg/zulip,eeshangarg/zulip,andersk/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,zulip/zulip,kou/zulip,andersk/zulip,kou/zulip,kou/zulip,rht/zulip,rht/zulip,rht/zulip,kou/zulip,zulip/zulip,zulip/zulip,zulip/zulip,kou/zulip,eeshangarg/zulip,rht/zulip,andersk/zulip,zulip/zulip,andersk/zulip,rht/zulip