css: Use SCSS nesting for `.portico-container` in portico.scss.
css: Use SCSS nesting for `.portico-container` in portico.scss.

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