Show latest addon size

[lonelyghost]

• Fetch latest addon version's size
• If an addon size is present, show a Size section
• Split dependency-size component into addon-size and dependency-size-toggle
• Remove fixed width for first column of addon size layout
• Fix some media queries that didn't work
• Make spacing below Review section consistent with or without comments

[codecov[bot]]

Codecov Report

Merging #222 (b2c3a9f) into master (e88ad6c) will decrease coverage by 0.63%. The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master     #222      +/-   ##
==========================================
- Coverage   82.72%   82.08%   -0.64%     
==========================================
  Files         135      136       +1     
  Lines        1007     1016       +9     
==========================================
+ Hits          833      834       +1     
- Misses        174      182       +8     

Impacted Files	Coverage Δ
app/components/addon-size.js	25.00% <ø> (ø)
app/routes/addons/show.js	90.90% <ø> (ø)
app/components/dependency-size-toggle.js	77.77% <77.77%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update e88ad6c...b2c3a9f. Read the comment docs.

[kategengler]

I can't approve the percy diff, but I looked at it and it looks good.