stylelint: Add more stylistic rules to lock down CSS a bit tighter.
stylelint: Add more stylistic rules to lock down CSS a bit tighter.

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