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Remove deprecated Staticman v1 config

Close #2386

fixed typo in  page_hero (#2428)

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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)

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Add Irish (Gaeilge) locale to ui-text.yml (#2422)

Fix rake vulnerability in .gemspec file

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fix: Do not redirect user away from site after they submit a comment (#2402)

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Disable box-shadow for radio and checkbox (#2398)

Bump Jekyll gem dependency to `v3.7`

Regression for mmistakes#2332 (#2385)

* Regression for mmistakes#2332

There's already a `relative_url` in place, shouldn't stack up another

* Update CHANGELOG and history