Bump dependencies

Fix author profile links `z-index` order on small screens

Close #2440

Update smooth-scroll.js to `v16.1.2`

Close #2430

Force rebuild of site

Release 4.19.0 💎

Remove unused variables

Update CHANGELOG and history

Add "click" overlay to close masthead and follow button menus when open

Fixes #1168

Remove delay on menu close

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Remove deprecated Staticman v1 config

Close #2386

fixed typo in  page_hero (#2428)

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Update CHANGELOG and history

Use relative_url and absolute_url where possible (#2387)

* Use relative_url and absolute_url where possible

Drops the `contains "://"` check, adopt Jekyll 3.7
Ref: https://github.com/mmistakes/minimal-mistakes/pull/2385#issuecomment-579882236

* One more unneeded {% assign %}

* Remove one more assign as noted by mmistakes

* Consolidate 4 more captures

* Consolidate an extra assign on "active" class

Improve headline hierarchy

Add headline specific Sass variables:

```scss
$h-size-1: 1.563em !default; // ~25.008px
$h-size-2: 1.25em !default; // ~20px
$h-size-3: 1.125em !default; // ~18px
$h-size-4: 1.0625em !default; // ~17px
$h-size-5: 1.03125em !default; // ~16.5px
$h-size-6: 1em !default; // ~16px
```

Fixes #2423

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Improve accessiblity of default skin by increasing color contrast

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Hide hidden posts from listings (#2345)