landing-page: Remove incorrect gray text.
landing-page: Remove incorrect gray text.

This changes some text that would display gray when on a blue body
text page; we considered changing the opacity instead, but probably we
should just delete this..

rht/zulip,showell/zulip,jackrzhang/zulip,hackerkid/zulip,hackerkid/zulip,andersk/zulip,timabbott/zulip,punchagan/zulip,eeshangarg/zulip,hackerkid/zulip,tommyip/zulip,dhcrzf/zulip,brainwane/zulip,mahim97/zulip,shubhamdhama/zulip,showell/zulip,shubhamdhama/zulip,rht/zulip,jackrzhang/zulip,andersk/zulip,timabbott/zulip,rishig/zulip,synicalsyntax/zulip,synicalsyntax/zulip,punchagan/zulip,tommyip/zulip,kou/zulip,rht/zulip,kou/zulip,dhcrzf/zulip,jackrzhang/zulip,zulip/zulip,timabbott/zulip,punchagan/zulip,showell/zulip,dhcrzf/zulip,andersk/zulip,eeshangarg/zulip,tommyip/zulip,brockwhittaker/zulip,tommyip/zulip,brockwhittaker/zulip,showell/zulip,zulip/zulip,Galexrt/zulip,Galexrt/zulip,Galexrt/zulip,jackrzhang/zulip,rht/zulip,kou/zulip,zulip/zulip,brainwane/zulip,shubhamdhama/zulip,andersk/zulip,hackerkid/zulip,mahim97/zulip,eeshangarg/zulip,mahim97/zulip,synicalsyntax/zulip,rishig/zulip,kou/zulip,rishig/zulip,timabbott/zulip,timabbott/zulip,dhcrzf/zulip,punchagan/zulip,shubhamdhama/zulip,Galexrt/zulip,zulip/zulip,rishig/zulip,kou/zulip,brainwane/zulip,rht/zulip,brockwhittaker/zulip,brainwane/zulip,shubhamdhama/zulip,rishig/zulip,mahim97/zulip,Galexrt/zulip,eeshangarg/zulip,rht/zulip,synicalsyntax/zulip,zulip/zulip,andersk/zulip,mahim97/zulip,jackrzhang/zulip,hackerkid/zulip,tommyip/zulip,shubhamdhama/zulip,dhcrzf/zulip,showell/zulip,timabbott/zulip,dhcrzf/zulip,brockwhittaker/zulip,synicalsyntax/zulip,rht/zulip,Galexrt/zulip,brainwane/zulip,jackrzhang/zulip,dhcrzf/zulip,brainwane/zulip,kou/zulip,eeshangarg/zulip,tommyip/zulip,eeshangarg/zulip,kou/zulip,Galexrt/zulip,zulip/zulip,mahim97/zulip,showell/zulip,showell/zulip,andersk/zulip,rishig/zulip,punchagan/zulip,brockwhittaker/zulip,eeshangarg/zulip,punchagan/zulip,brockwhittaker/zulip,rishig/zulip,hackerkid/zulip,synicalsyntax/zulip,timabbott/zulip,hackerkid/zulip,jackrzhang/zulip,tommyip/zulip,brainwane/zulip,andersk/zulip,synicalsyntax/zulip,shubhamdhama/zulip,zulip/zulip,punchagan/zulip