Add content to search index

[patrickdaze]

This PR adds the contents of pages to the search index. The current search index only has page title.

PR improves search by:

• Allowing to search deeper into the documentation (queries such as "has-text" or "input size")
• Providing more search results for short queries (such as "nested").

While this PR might not be best the long term solution, I think it's more than sufficient for the time being. A better solution might be something like algolia/jekyll-algolia, or DocSearch.

PR Contents

• Added dotenv
• Indexer refactor
• Adds page content search index
• Adds page sections to search index: allows to skip to more relevant content within a single page
• Frontend (search UI) updated to display relevant page content

Demo

Hosted: https://elegant-fermi-69a8e6.netlify.com/

Side-by-side comparison: Image

[zoe-edwards]

A-ma-zing

Would it be possible to format the PHP to meet PSR?

[patrickdaze]

Sure can! With a couple of manual changes (namespaces, etc), automating it would probably be a good option.

I can set things up to work with StyleCI or PHP CS Fixer.

• StyleCI with recommended settings, otherwise
• PHP-CS-Fixer with PSR-2 or PSR-12 by using custom rules until PSR-12 is supported

@ThomasEdwards Preference between StyleCI or PHP CS Fixer?

[zoe-edwards]

Not used either before! StyleCI looks like a good start – have signed up, hopefully will come through here.

[patrickdaze]

I applied code style fixes conforming to #4