Aud/fea/toast notifications

[AudreyBil]

This small PR adds new toast notifications where it makes sense + remove all console logs, warnings, errors.

Toast notifications added:

• event created
• event saved as draft
• event creation failed
• location created
• Location creation failed
• File removal
• Account creation

Fix console warnings:
On homepage:

• Root index route with no Component: React router needs something in Component for leaf routes. I added Component: () => null as the loader always redirects before anything renders.
• No HydrateFallback element provided to rend during initial hydration: Irrelevant for us as we do not do SSR, I used HydrateFallback:() => null to silence the warning.

• A few other react warning

Other Fix:
Only public events where showing on the Event Feed page. Now, public events + privates events the user is going to or is invited too are also showing up in the feed.

Console errors left:
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