Reduce white-space to trim down filesize

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Improve syntax highlighting styles (#1450)

* Cleanup syntax highlighting styles
* Replace hardcoded color values with [base16](http://chriskempson.com/projects/base16/) Sass variables
* Harmonize padding between GFM code blocks and `{% highlight %}` code blocks
*  Improve readability of line numbers
* Add longer code block example to test double digit line numbers
* Adjust code block colors for specific skins

Add Prettier ignore file

Stop prettier from messing with Markdown files.

Fix grammar

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 Minimize JSON data (#1449)

* Remove Lunr trimmer & bring back colons

* Add Greek Stemmer

* Translate search_placeholder_text and results_found to Greek

* Minimize JSON data

* Truncate Words

* Move store variable into a new file

* Move Lunr files into a new folder

* Add defer to lunr scripts

* Add search_full_content switch

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Upgrade Font Awesome to version 5 (#1446)

Upgrade Font Awesome to version 5 (SVG with JavaScript)

Close #1396

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

* 'master' of https://github.com/mmistakes/minimal-mistakes:
  Only load Lunr languages that exist in theme

Only load Lunr languages that exist in theme

ref: https://github.com/mmistakes/minimal-mistakes/pull/1445#issuecomment-355153434

Only load Lunr languages that exist in theme

ref https://github.com/mmistakes/minimal-mistakes/pull/1445#issuecomment-355153434

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Fix stuck sidebar when resizing viewport

Close #1447

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Add lunr-gr.js and fix lunr-en.js  (#1445)

* Remove Lunr trimmer & bring back colons
* Add Greek Stemmer
* Translate `search_placeholder_text` and `results_found` to Greek

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Round top right corner of code block icon

Reduce visual weight of code blocks

Flatten shadow and remove borders relying on background color to highlight code.

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