perf(module: site): use https by default

[fisherspy]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd-mobile/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[x] Documentation content changes
[x] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #373 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #373   +/-   ##
=======================================
  Coverage   89.56%   89.56%           
=======================================
  Files         229      229           
  Lines        6892     6892           
  Branches      564      564           
=======================================
  Hits         6173     6173           
  Misses        554      554           
  Partials      165      165

Impacted Files	Coverage Δ
components/polyfills.ts	100% <ø> (ø)	⬆️
components/image-picker/image-picker.component.ts	79.81% <ø> (ø)	⬆️
components/core/util/icon.ts	93.75% <ø> (ø)	⬆️

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