Community Author Information is a "Snapshot" rather than live

Is your feature request related to a problem? Please describe.
If you make a post in the community, your current avatar, email address, nickname, etc are all saved in Mongo at that moment. This causes a few issues:

• If the author modifies any of their information, this isn't reflect in the community
• Saving the image data in mongo creates overhead + the UI is less responsive when returning base64encoded image data.

Describe the solution you'd like
Change author information to be return dynamically. Additionally, don't save any image information in mongo or return image data as base64encoded info. Instead add a new endpoint that dynamically returns the correct user's avatar. Less overhead, less storage, plus caching rules can be set up for the images that the browser can handle.

Start by tracing how community post authors are persisted and returned through the API, including where MongoDB stores author and image data. Done means author details are returned dynamically, image data is no longer stored or base64-encoded in responses, and a user-avatar endpoint exists with browser-cacheable responses.