[FIX] web_unsplash: new guidelines negociated with Unsplash

Unsplash CEO asked us to stop exposing our key client side (even if it was
only in the browser network and previously allowed by their API team leader).

Also, all our Odoo instances (on premise or not) should share the same
production key, which is not possible in our case obviously.

After multiple exchange, it has been negociated that:
1. Our non saas user won't be able to apply for a production key and should
   prefix they Unsplash application name by 'Odoo:'. Their key will remain in
   test mode.
   Indeed, Unsplash won't be able to review every Odoo application and ensure
   it respects the API terms and it is a real application.
2. Our saas user will query Unsplash server side so the key remain hidden.
3. The documentation should explain it all

task-1911345

closes odoo/odoo#28804

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