Add Autocomplete icon

[hanzei]

Summary

Ticket Link

Fixes #652

[hanzei]

@jfrerich I would love to get this into v3.0 as it's a quick but great improvment.

[codecov-commenter]

Codecov Report

Merging #653 into master will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #653      +/-   ##
==========================================
+ Coverage   34.50%   34.71%   +0.21%     
==========================================
  Files          51       51              
  Lines        5684     5692       +8     
==========================================
+ Hits         1961     1976      +15     
+ Misses       3530     3524       -6     
+ Partials      193      192       -1     

Impacted Files	Coverage Δ
server/command.go	19.34% <100.00%> (+0.97%)	⬆️
server/subscribe.go	68.89% <0.00%> (+0.38%)	⬆️
server/plugin.go	17.15% <0.00%> (+1.18%)	⬆️
server/instances.go	37.61% <0.00%> (+1.37%)	⬆️

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[jfrerich]

@hanzei, this is awesome! Thanks!

[DHaussermann]

Tested and passed

• Icon always displays as expected
• Checked icon looks good on all themes
• Tested on desktop and various browsers
• Checked browser dev tools Console and network tab - saw nothing out of the ordinary

LGTM!