Change clone protocol from git:// to https://

Cloning with git: protocol doesn't allow to change anything in `.git/`, like when using `git pull`.
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Updare grunt-jekyll dependency
Remove [type]

type="text/css" isn't needed
Merge pull request #10996 from ZDroid/patch-6

Updare grunt-jekyll dependency
Merge pull request #10998 from ZDroid/patch-7

Remove [type]
Merge pull request #10896 from ZDroid/patch-3

Change clone protocol from git:// to https://
there's no reason for holder.js to be executable
Customizer: include config.json in bootstrap.zip

merges #10633; fixes part of #9951
Fixes #9925: convert font data to base64, fixing 0xefbfbd (Unicode Replacement Character) chars in customizer fonts.

Merges #9982
trivial refactor in build-customizer grunt task
fix #10805
Convert "Recess" to "RECESS"

Except when speaking of the "recess" Node package, RECESS should be in all-caps.
Merge pull request #10956 from ZDroid/patch-4

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upgrade holder.js to v2.1
re-remove execute permissions; apparent upstream bug
Merge branch 'master' of https://github.com/twbs/bootstrap into develop