Support our own notifications #398
                
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Resolves #293
Instead of using custom notifications, which is supported on near.org (but contains quite a few bugs) and isn't supported on near.social, I thought of adding our own index like
buildhub.near/{{feature}}/{{action}}.Because now we have our own notifications page in gateway, where we can easily support it.
Eg: for proposal, it will be
buildhub.near/proposal/vote,buildhub.near/proposal/create, similarly we can have it for events, and other features. We can have "Approve", "Reject", "View", all these different actions for different type of feature and actions.@elliotBraem what do you think of the idea and structure? if you agree, I will continue to add further changes to the PR