"new" pill in the ToC

[adriendupuis]

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Each month, along side the "New in documentation" page, pages with changes can be highlighted in the table of content / navigation.

"new" doesn't necessarily mean that the page is new but that something is new in it. "Update" is too long for the little place there is in the ToC. To distinguish "new" and "updated" isn't relevant enough. Let's have only "new".

By having month_change: true in the page metadata (at the top of its .md file), a "New" pill is displayed at the right side of its ToC entry.

Because of this mechanism, it can't be added to the PHP API Reference which is directly in HTML and can't be converted to a Markdown trick.

Previews:

Look in ToC for May changes:

• API > PHP API > PHP API
• Administration > Back Office > Recent activity

It works when the item is the current page, and when it isn't.

Checklist

• Text renders correctly
• Text has been checked with vale
• Description metadata is up to date
• Redirects cover removed/moved pages
• Code samples are working
• PHP code samples have been fixed with PHP CS fixer
• Added link to this PR in relevant JIRA ticket or code PR

[adriendupuis]

Thank you @juskora for this idea spotted in CKEditor Doc

[adriendupuis]

Thank you @IdaDra for tuning the design.