ci: Re-enable testing documentation links.
ci: Re-enable testing documentation links.

We've had a few unpleasant bugs with real documentation links being
broken, so we're going to make this more aggressive for now.

I think we instead want a more subtle option for suppressing failures
in some places but not others.

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