portico: Improve spacing of headers on plans page.
portico: Improve spacing of headers on plans page.

This adjusts the spacing on the plans page so there is more
breathing room between "Get started today" and the headings
below it.

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