hotspots: Decrease default hotspot icon z-index to 100.
hotspots: Decrease default hotspot icon z-index to 100.

This keeps hotspot icons positioned at the front of the message
viewport but behind sidebars (i.e. the left sidebar has a z-index
of 103). Hotspots associated with elements outside of the message
viewport should be individually adjusted at the bottom of hotspots.css.

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