Feature: support coinmarketcap slugs

[shamoon]

Proposed change

This allows specifying slug with coinmarketcap since crypto does dumb things like reuse their crypto symbols. So this supports e.g.

          widget:
               type: coinmarketcap
               slugs: [chia-network, uniswap]
               defaultinterval: "1h"
               key: ...

Closes #1683

Type of change

• New service widget
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Other (please explain)

Checklist:

• If adding a service widget or a change that requires it, I have added a corresponding PR to the documentation here: benphelps/homepage-docs@1658504
• If adding a new widget I have reviewed the guidelines.
• If applicable, I have checked that all tests pass with e.g. pnpm lint.
• If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.

[insunaa]

Thank you very much for this incredibly fast fix/feature! <3

[github-actions]

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