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lunr 2.3.5 update (#2010)

Fix typo

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shorter IE conditional statement (#2006)

saves 5 bytes :-)

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Persian Translation of UI Elements (#2004)

* Add Persian translation to ui-text.yml
* Mention the added Persian translation in the documentation

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[Bug fix]: Added missing Staticman Spanish UI text (#1997)

Taken from line 91 of 5d-eu/messages.php@ec56008

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Remove unused variables (#1996)

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update font awesome (#1995)

REF: https://fontawesome.com/changelog/latest

HTTPS Twitter short link (#2001)

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Allow sidebar navs with custom sidebar content

Multiple sidebar navs can also be included on a page:

```
sidebar:
  - title: Navigation 1
    nav: nav1
  - title: Navigation 2
    nav: nav2
```

Fixes #1986

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Fix function name for Google Custom Search (#1983)

fbafe58e40b1bd4a2628aef1eb5955ab57dcfaf4 renamed the function in the
scripts file, but did not rename the call sites.

Update README.md (#1982)

Just a minor addition, the word Hindi written in devnagri script (the script used for this language). Makes it easier to visually understand what script we are talking about.

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