Add settings option to edit Gravatar and Site Icon

[elibud]

Currently tapping on your gravatar or your site icon is the only way to edit them. We want to add a more explicit option.

From @mattmiklic: a discrete option in profile settings / site settings for profile photo and site icon is probably the way to go.

cc: @tonyr59h

[tonyr59h]

Some mockups from @mattmiklic:

[mindgraffiti]

Reopening - site settings icon feature not yet implemented. (Me > My Profile photo feature is done.)

[stale]

This issue has been marked as stale because:

• It has been inactive for the past year.
• It isn't in a project or a milestone.
• It hasn’t been labeled [Pri] Blocker, [Pri] High, or good first issue.

Please comment with an update if you believe this issue is still valid or if it can be closed. This issue will also be reviewed for validity and priority (cc @designsimply).