feat(docs): use https url

[levithomason]

The doc site now supports HTTPS. Many users are linking to HTTPS, however, our SPA redirects for handling soft routes are using HTTP. This means direct links to HTTPS urls are lost and the user is redirected to the default route.

This PR moves all links to the HTTPS url.

I also fixed the Direct Link copy functionality, it was only copying the slug, now it copies the href.

[codecov-io]

Codecov Report

Merging #1598 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1598   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files         141      141           
  Lines        2396     2396           
=======================================
  Hits         2390     2390           
  Misses          6        6

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