use PWA cache storage to serve iconify collections

[Joaquín Sánchez]

Clear and concise description of the problem

Right now, icones website adds all iconify collections from local, check postinstall script.

Client may end with all collections twice in the browser storage: in PWA cache storage and local storage.

Suggested solution

Add a custom SW to intercept fetch to iconify api calls, returning the local one.

With this solution we need to publish icones once iconify collections changes, maybe a few times per week/month.

Alternative

None

Additional context

No response

Validations

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