docs: Remove BETA label for widget docs.
docs: Remove BETA label for widget docs.

eeshangarg/zulip,eeshangarg/zulip,punchagan/zulip,andersk/zulip,rht/zulip,punchagan/zulip,eeshangarg/zulip,hackerkid/zulip,andersk/zulip,punchagan/zulip,andersk/zulip,kou/zulip,kou/zulip,kou/zulip,zulip/zulip,kou/zulip,kou/zulip,punchagan/zulip,hackerkid/zulip,eeshangarg/zulip,hackerkid/zulip,hackerkid/zulip,rht/zulip,punchagan/zulip,andersk/zulip,andersk/zulip,eeshangarg/zulip,andersk/zulip,rht/zulip,zulip/zulip,andersk/zulip,rht/zulip,eeshangarg/zulip,punchagan/zulip,zulip/zulip,rht/zulip,zulip/zulip,hackerkid/zulip,eeshangarg/zulip,rht/zulip,kou/zulip,hackerkid/zulip,punchagan/zulip,zulip/zulip,kou/zulip,zulip/zulip,hackerkid/zulip,rht/zulip,zulip/zulip