Merge branch 'docs' into 'master'

Tuning Docs - Redis Compression

See merge request allianceauth/allianceauth!1475

docs/maintenance/tuning/index.md

@@ -13,4 +13,5 @@ The official installation guide will install a stable version of Alliance Auth t
 
     gunicorn
     celery
+    redis
 ```

docs/maintenance/tuning/redis.md

@@ -0,0 +1,22 @@
+# Redis
+
+## Compression
+
+Cache compression can help tame the memory usage of specialised installation configurations and Community Apps that heavily utilize Redis.
+
+Various compression algorithms are supported, with various strengths. Our testing has shown that lzma works best with our use cases. You can read more at [Django-Redis Compression Support](https://github.com/jazzband/django-redis#compression-support)
+
+Add the following lines to `local.py`
+
+```python
+import lzma
+
+CACHES = {
+    "default": {
+        # ...
+        "OPTIONS": {
+            "COMPRESSOR": "django_redis.compressors.lzma.LzmaCompressor",
+        }
+    }
+}
+```