portico: Add hover behavior for app icons on /hello.
portico: Add hover behavior for app icons on /hello.

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