delete old docs (#327)

* delete old docs

* new docs

docs/pages/location/docker.md

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+# Docker
+
+autorestic supports docker volumes directly, without needing them to be mounted to the host filesystem.
+
+```yaml | docker-compose.yml
+version: '3.8'
+
+volumes:
+  data:
+    name: my-data
+
+services:
+  api:
+    image: alpine
+    volumes:
+      - data:/foo/bar
+```
+
+```yaml | .autorestic.yml
+locations:
+  foo:
+    from: my-data
+    type: volume
+    # ...
+```
+
+Now you can backup and restore as always.
+
+```bash
+autorestic backup -l hello
+```
+
+```bash
+autorestic restore -l hello
+```
+
+The volume has to exists whenever backing up or restoring.