Update jQuery to v3.4.1

ref #2137

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Update Gumshoe to v5.1.1

Fixes #2140

Release 4.16.2 💎

Revert back to jQuery v3.3.1

3.4.0 causes issues with older jQuery plugins that haven't been updated to support it.

Release 4.16.1 💎

Add link to MM remote theme starter

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Update layout compress from v3.0.2 to v3.1.0 (#2128)

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Update jquery v3.3.1 to v3.4.0 (#2129)

* Update jquery v3.3.1 to v3.4.0
* Update `main.min.js`

Close #2127 

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Made Gumshoe contingent upon a TOC being present. This prevents a console error on pages without a TOC. (#2124)

Release 4.16.0 💎

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Improve search `input` semantics (#2123)

* Update search_form.html

Updates Issue #2122 by adding the correct input type and aria label.

* update search_form.html

should be area-placeholder. My mistake. Updates Issue #2122

* fix aria-placeholder

Updates issue #2123 with a typo found by @mmistakes for liquid syntax.

Close #2122

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Merge branch 'master' of https://github.com/mmistakes/minimal-mistakes

* 'master' of https://github.com/mmistakes/minimal-mistakes:
  Allow adding JavaScript files after the theme's (#2116)

Allow adding JavaScript files after the theme's (#2116)

Allow adding JavaScript files after those bundled in the theme

Close #2110 

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