docs: Separate recommend and vagrant setup sections for dev setup.
docs: Separate recommend and vagrant setup sections for dev setup.

This will possibly direct more users towards WSL setup on Windows.

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