Revised 'search' and catalog' icons.

[L0ZZI]

Long overdue but here's a more proportional search icon and a revised catalog icon that fits our visual language better. Attached SVG's and Figma link, https://www.figma.com/file/oUqhjUvBzA8vS56Ld48gJc/Revised-Icons?node-id=1%3A384&t=hBLTfGCapnDPJb5q-1

I would try and fork the repository, but I'm not setup for it... Grommet-Revised_Icons.zip

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ToDos

• [ ] Confirm the proposed icons are implemented with stroke as requested here.
• [ ] Add to icons library in Figma
• [ ] Add to grommet-icons repository