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frontend: Redesign templates/5xx error page.

brockwhittaker/zulip,punchagan/zulip,showell/zulip,jackrzhang/zulip,tommyip/zulip,brainwane/zulip,andersk/zulip,eeshangarg/zulip,hackerkid/zulip,Galexrt/zulip,vaidap/zulip,shubhamdhama/zulip,kou/zulip,hackerkid/zulip,vaidap/zulip,showell/zulip,brainwane/zulip,hackerkid/zulip,timabbott/zulip,rht/zulip,brainwane/zulip,andersk/zulip,tommyip/zulip,brainwane/zulip,mahim97/zulip,dhcrzf/zulip,punchagan/zulip,jackrzhang/zulip,mahim97/zulip,brockwhittaker/zulip,zulip/zulip,brockwhittaker/zulip,jrowan/zulip,punchagan/zulip,amanharitsh123/zulip,vaidap/zulip,Galexrt/zulip,jackrzhang/zulip,showell/zulip,amanharitsh123/zulip,kou/zulip,synicalsyntax/zulip,shubhamdhama/zulip,punchagan/zulip,brainwane/zulip,hackerkid/zulip,verma-varsha/zulip,timabbott/zulip,rishig/zulip,punchagan/zulip,dhcrzf/zulip,rht/zulip,andersk/zulip,kou/zulip,verma-varsha/zulip,Galexrt/zulip,rht/zulip,showell/zulip,rht/zulip,eeshangarg/zulip,Galexrt/zulip,tommyip/zulip,shubhamdhama/zulip,andersk/zulip,vaidap/zulip,brockwhittaker/zulip,amanharitsh123/zulip,brockwhittaker/zulip,andersk/zulip,punchagan/zulip,brockwhittaker/zulip,timabbott/zulip,kou/zulip,eeshangarg/zulip,rishig/zulip,rishig/zulip,shubhamdhama/zulip,amanharitsh123/zulip,synicalsyntax/zulip,hackerkid/zulip,zulip/zulip,mahim97/zulip,timabbott/zulip,vabs22/zulip,rishig/zulip,mahim97/zulip,vaidap/zulip,jackrzhang/zulip,shubhamdhama/zulip,brainwane/zulip,dhcrzf/zulip,brainwane/zulip,jrowan/zulip,showell/zulip,hackerkid/zulip,hackerkid/zulip,eeshangarg/zulip,shubhamdhama/zulip,rishig/zulip,eeshangarg/zulip,timabbott/zulip,punchagan/zulip,vabs22/zulip,shubhamdhama/zulip,amanharitsh123/zulip,Galexrt/zulip,jackrzhang/zulip,kou/zulip,synicalsyntax/zulip,eeshangarg/zulip,verma-varsha/zulip,vabs22/zulip,dhcrzf/zulip,kou/zulip,tommyip/zulip,verma-varsha/zulip,andersk/zulip,verma-varsha/zulip,synicalsyntax/zulip,mahim97/zulip,rht/zulip,dhcrzf/zulip,synicalsyntax/zulip,vabs22/zulip,zulip/zulip,jackrzhang/zulip,jrowan/zulip,andersk/zulip,timabbott/zulip,zulip/zulip,zulip/zulip,mahim97/zulip,amanharitsh123/zulip,rishig/zulip,jackrzhang/zulip,jrowan/zulip,rishig/zulip,jrowan/zulip,verma-varsha/zulip,rht/zulip,tommyip/zulip,rht/zulip,vaidap/zulip,eeshangarg/zulip,vabs22/zulip,zulip/zulip,zulip/zulip,Galexrt/zulip,synicalsyntax/zulip,dhcrzf/zulip,jrowan/zulip,showell/zulip,synicalsyntax/zulip,showell/zulip,kou/zulip,Galexrt/zulip,dhcrzf/zulip,timabbott/zulip,vabs22/zulip,tommyip/zulip,tommyip/zulip