Update dependency @metalsmith/collections to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@metalsmith/collections	^1.3.1 → ^2.0.0

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Release Notes

metalsmith/collections (@​metalsmith/collections)

v2.0.0

Compare Source

• Closes #​98: adds 'first' & 'last' references when refer:true #98
• BREAKING: Closes #​101: condenses sortBy, reverse into sort option. Renames filterBy option to filter. #101
• Updates README.md, fixes ESLint issues, versions build to allow npm installing from repo f9da8e4
• BREAKING: references (previous, next,..) are set on file.collection[name][previous/next] as arrays 8c7d9d6
• BREAKING: collections are only available via metalsmith.metadata().collections e8e2760
• Require metalsmith > 2.6.0 & use metalsmith.matter instead of removed dependency read-metadata c0748fa
• BREAKING: collection metadata can only be added from in-source files df507d6
• BREAKING: Make metadata accessible from Collection array instead of '.metadata' property 42f45c8
• BREAKING: Adds 'path' property to sorting context, and changes the default sorting to path:asc 64b5f72
• Drops support for Node < 14.14.0, updates CI, drops Gitter notification 36eb59d
• BREAKING: no longer sets 'file.path' property df26510
• Better documentation for sorting + typescript 1d3f81e

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