Account Notifications - Add tooltip to icon and include the action in the "More" menu.

Clear and concise description of the problem

Building on the changes I made in #985 I would like to create a new pull request to make further enhancements to the Notification feature on the Account profile view to provide consistency to the patterns found in the Elk codebase and give users more clarification on what action would occur when clicking the icon.

What are "Notifications"? For an end user, enabling notifications on a followed account means that they will receive a notification anytime this account posts something new.

Suggested solution

I would like to make the following changes specifically:

• Adding a tooltip to the notification icon on the AccountHeader view
• Use the term "Notifications" throughout code and ui for consistency.
• Add the notifications to the AccountMoreButton component in addition to the icon.

The reason for adding the action in multiple places is that if someone is unsure what "Notifications" means via the tooltip, the More command of "Enable notifications for {user.x}" should make that clear. If you toggle the bell the menu item is affected, and vice versa.

Here's a demonstration of these new updates:

Alternative

If the notification bell is going to be included in a release, the CommonTooltip should be added if nothing else. The "More" dropdown item could be removed if duplicating the action is considered against the UI/UX design patterns in Elk.

I'm also open to suggestions on the placement of the bell icon and the icon used for it. Elk uses a LOT of icons so here are a few alternatives I thought might work that do not conflict with others already in use. You can also peruse available icon options on Remix.

Additional context

This is my first opensource contribution, other than opening issues and having someone else do it, so any words of advice or recommendations are greatly appreciated. I want to make sure this request benefits the community and makes me proud of my contribution. Thanks!

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