left-sidebar: Change icons to be translucent.
left-sidebar: Change icons to be translucent.

This changes the icons to be translucent rather than grey and also
makes them get darker on hover rather than lighter (which didn’t really
make sense) on the normal theme.

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