delete old docs (#327)

* delete old docs

* new docs

docs/pages/backend/options.md

@@ -0,0 +1,17 @@
+# Options
+
+> ℹ️ For more detail see the [location docs](/location/options) for options, as they are the same.
+
+```yaml
+backend:
+  foo:
+    type: ...
+    path: ...
+    options:
+      backup:
+        tag:
+          - foo
+          - bar
+```
+
+In this example, whenever `autorestic` runs `restic backup` it will append a `--tag abc --tag` to the native command.