Searchable collection page

[ninabreznik]

@todo

• [x] concept (wireframes?, style?, content?, sections?)
• [x] styling individual card
• [x] search bar (basic + advanced search)
• [x] top menu bar
• [x] pagination

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• we should add links to current wireframes

[ninabreznik]

@fionataeyang I updated collection-page. Feel free to pull the newest version to avoid conflicts later.

How's your working going? Let me know if you want to jump on a call...