Fix(docs): removes redundant information

Improves nginx docker readability

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2533>

docker/nginx/conf.dev

@@ -88,7 +88,7 @@ http {
             expires 1d;
         }
 
-        location ~ "/(front/)?embed.html" {
+        location = /embed.html {
             add_header Content-Security-Policy "connect-src https: http: 'self'; default-src 'self'; script-src 'self' unpkg.com 'unsafe-inline' 'unsafe-eval'; style-src https: http: 'self' 'unsafe-inline'; img-src https: http: 'self' data:; font-src https: http: 'self' data:; object-src 'none'; media-src https: http: 'self' data:";
             add_header Referrer-Policy "strict-origin-when-cross-origin";
 

docs/developer/setup/docker.md

@@ -53,7 +53,6 @@ To set up your Docker environment:
    ```text
    MEDIA_URL=http://localhost:8000/media/
    STATIC_URL=http://localhost:8000/staticfiles/
-   MEDIA_ROOT=/data/media
    ```
 
 3. Create a network for federation support