[now-static-build] Make curl silent

[styfle]

We added a message in #3068 so this PR makes curl silent unless it errors.

Also fix typo in Gutenberg 😉

PRODUCT-7 #close

[codecov-io]

Codecov Report

Merging #3090 into canary will increase coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           canary    #3090      +/-   ##
==========================================
+ Coverage   11.33%   11.34%   +<.01%     
==========================================
  Files         268      268              
  Lines       10064    10068       +4     
  Branches     1314     1313       -1     
==========================================
+ Hits         1141     1142       +1     
- Misses       8830     8833       +3     
  Partials       93       93

Impacted Files	Coverage Δ
src/commands/deploy/latest.js	0% <0%> (ø)	⬆️
src/util/handle-error.ts	38.88% <0%> (ø)	⬆️
src/commands/deploy/legacy.ts	0% <0%> (ø)	⬆️
src/util/deploy/process-deployment.ts	0% <0%> (ø)	⬆️
src/util/deploy/create-deploy.js	0% <0%> (ø)	⬆️
src/util/errors-ts.ts	47.48% <0%> (+0.02%)	⬆️

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