Add support for custom icon set

[onmax]

Clear and concise description of the problem

I am working on my own icon set. I am using the Iconify specification.

I have my own Icons explorer, which is heavily inspired by the design of Icones, but it is becoming cumbersome to maintain.

Instead, I am looking into externalizing the icons explorer component into Icones. In my documentation I would like to add "Open Icons explorer" and redirect user to icones.

Suggested solution

I propose the following

New query param

A url that points to a Iconify JSON file. e.g. https://icones.js.org/collection/custom-icon-set?url=https://raw.githubusercontent.com/onmax/nimiq-ui/b354f04e4d1d3a4836e2036ba2beb79d16afca45/packages/nimiq-icons/dist/icons.json

Update the "Install Iconfiy Iconset" instructions

Since we cannot ensure the package exists in npm, we can show as an alternative a link to the documentation using the link from the author.url: https://iconify.design/docs/types/iconify-info.html#author.

Alternative

1. Build my own icon explorer
2. Fork this project

Additional context

If you think this idea is worth it, I would love to start working on it and make a PR :)

Validations

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• Read the Contributing Guide.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.