integrations: Remove compatibility code for HTML format docs.
integrations: Remove compatibility code for HTML format docs.

This fixes a coverage error in Travis CI caused by this code no longer
being used.

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