fix: fix broken avatar directive

[jackson-dean]

After a recent styling refactor the avatar directive was broken because the file it was referencing for the default profile image was removed.

Here we simplify things and just make the avatar directive fully self contained, as there is no real reason to pass window.host or window.origin as an argument since it is a simple globally accessible value.

[jackson-dean]

Current dependencies on/for this PR:

• main
  • PR #262
  • PR #263
    • PR #264
    • PR #274
    • PR #266
      • PR #272
      • PR #268
      • PR #269
        • PR #270
        • PR #273
          • PR #277
          • PR #279
        • PR #271
      • PR #267
    • PR #265 👈

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