Various bugs in profile page

[QuinnWuest]

Describe the bug

When viewing a profile, the URL will appear as something like:

• https://proavalon.com/profile/QuinnWuest

If the URL has a / at the end, for example:

• https://proavalon.com/profile/QuinnWuest/

Two bugs occur:

• If the profile uses the base avatar, it will fail to render.
• The "Search a username..." box will fail to work properly. It will attempt to link to an invalid page, for example:
• https://proavalon.com/profile/QuinnWuest/ProNub