Documentation Revamp

Co-authored-by: jbdoumenjou <jb.doumenjou@gmail.com>

docs/content/middlewares/compress.md

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+# Compress
+
+Compressing the Response before Sending it to the Client
+{: .subtitle }
+
+![Compress](../assets/img/middleware/compress.png)
+
+The Compress middleware enables the gzip compression. 
+
+## Configuration Examples
+
+??? example "File -- enable gzip compression"
+
+    ```toml
+    [Middlewares]
+      [Middlewares.test-compress.Compress]
+    ```
+    
+??? example "Docker -- enable gzip compression"
+
+    ```yml
+    a-container:
+          image: a-container-image 
+            labels:
+              - "traefik.middlewares.test-compress.compress=true",
+    ```
+
+## Notes
+
+Responses are compressed when:
+
+* The response body is larger than `512` bytes.
+* The `Accept-Encoding` request header contains `gzip`.
+* The response is not already compressed, i.e. the `Content-Encoding` response header is not already set.