chore: Add popover-responsive example

[diegohaz]

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[codecov]

Codecov Report

Merging #978 (398a870) into v2 (dec3cb3) will decrease coverage by 0.56%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##               v2     #978      +/-   ##
==========================================
- Coverage   65.59%   65.03%   -0.57%     
==========================================
  Files         171      173       +2     
  Lines        4244     4281      +37     
  Branches     1169     1173       +4     
==========================================
  Hits         2784     2784              
- Misses       1459     1496      +37     
  Partials        1        1              

Impacted Files	Coverage Δ
.../popover/__examples__/popover-responsive/index.tsx	0.00% <0.00%> (ø)
...pover/__examples__/popover-responsive/use-media.ts	0.00% <0.00%> (ø)

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