css: Use SCSS nesting for `.navbar.footer .nav` in portico.scss.
css: Use SCSS nesting for `.navbar.footer .nav` in portico.scss.

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