feat: add navigation icons

[joshuajames-smith]

Description

Adding 4 icons required for navigation rethink design - uploading .svg files and including in icons.ts to appear in staging. These icons should allow for a better UX of the navigation flow! They use icons to represent the product/platform and use arrow as a visual clue towards navigation processes.

Don't forget to reference all other pull requests which are associated to this one below: e.g.

relates gliff-ai/dominate#306

Documentation (delete if not applicable)

@philhallbio will need to update documentation once gliff-ai/dominate#306 has been fully implemented.

Checklist:

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