[FIX] website: restore some website rpc since new views

The website is not ready. It is still too young to understand what the
beautiful `_rpc` function can bring to its life. Someday it will, but
for now, it can at least rely on the `rpc.query` function or to the
'Ace' menu which now understands the beauty of `_rpc`.

---

-> Replace website `_rpc` calls with deprecated `rpc.query` as the
   website is not structured enough yet to handle 'trigger_up' events.

-> As the `_rpc` calls cannot be replaced for the ace editor because it
   is also used and tested in the backend, promote the 'Ace' menu (which
   instantiate the ace editor) to be a `ServiceProvider` so that the
   `_rpc` method works in this particular case.

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