Add support for uploading avatars (#767)

* Add uploading configured avatar images

* Add avatar assets

* Update docs and sample config

* Add changelog

* Fix sample config

* Add removing avatars when none configured

Author: justinbot

Dockerfile

@@ -42,6 +42,7 @@ RUN yarn --network-timeout 600000 --production --pure-lockfile && yarn cache cle
 
 COPY --from=builder /src/lib ./
 COPY --from=builder /src/public ./public
+COPY --from=builder /src/assets ./assets
 
 VOLUME /data
 EXPOSE 9993