* Increase efficiency and fix pagination offset issue
Right now we filter recently aggregated notifications at runtime, which worked before when there was no pagination, but now filtering is not a good idea combined with offset pagination because it throws off the calculations.
The filtering should be done in the SQL query before paginating, which is what we've switched to. I added a bunch of scopes to make the code clearer as well.
To avoid nesting tags I've also updated the HTML and the JS logic to insert it in the right place.
* Add explanation for hiding the load more button for new users
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