docs: Make more clear how installing from Git works.
docs: Make more clear how installing from Git works.

The previous discussion made it sound like this did a development
environment installation.

dhcrzf/zulip,rht/zulip,zulip/zulip,timabbott/zulip,brainwane/zulip,andersk/zulip,eeshangarg/zulip,dhcrzf/zulip,dhcrzf/zulip,shubhamdhama/zulip,eeshangarg/zulip,showell/zulip,hackerkid/zulip,shubhamdhama/zulip,zulip/zulip,rishig/zulip,zulip/zulip,timabbott/zulip,synicalsyntax/zulip,rishig/zulip,timabbott/zulip,hackerkid/zulip,shubhamdhama/zulip,eeshangarg/zulip,hackerkid/zulip,punchagan/zulip,synicalsyntax/zulip,shubhamdhama/zulip,eeshangarg/zulip,timabbott/zulip,hackerkid/zulip,punchagan/zulip,tommyip/zulip,kou/zulip,andersk/zulip,showell/zulip,tommyip/zulip,dhcrzf/zulip,timabbott/zulip,rishig/zulip,hackerkid/zulip,eeshangarg/zulip,tommyip/zulip,kou/zulip,punchagan/zulip,shubhamdhama/zulip,kou/zulip,brainwane/zulip,andersk/zulip,timabbott/zulip,kou/zulip,rht/zulip,punchagan/zulip,hackerkid/zulip,shubhamdhama/zulip,synicalsyntax/zulip,shubhamdhama/zulip,andersk/zulip,showell/zulip,eeshangarg/zulip,zulip/zulip,brainwane/zulip,dhcrzf/zulip,brainwane/zulip,rht/zulip,kou/zulip,kou/zulip,zulip/zulip,synicalsyntax/zulip,synicalsyntax/zulip,andersk/zulip,rishig/zulip,tommyip/zulip,synicalsyntax/zulip,punchagan/zulip,rht/zulip,brainwane/zulip,showell/zulip,rishig/zulip,andersk/zulip,tommyip/zulip,brainwane/zulip,showell/zulip,zulip/zulip,rishig/zulip,brainwane/zulip,tommyip/zulip,kou/zulip,rishig/zulip,rht/zulip,timabbott/zulip,dhcrzf/zulip,showell/zulip,showell/zulip,punchagan/zulip,tommyip/zulip,dhcrzf/zulip,hackerkid/zulip,rht/zulip,punchagan/zulip,synicalsyntax/zulip,zulip/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip