delete old docs (#327)

* delete old docs

* new docs

docs/pages/cli/check.md

@@ -0,0 +1,9 @@
+# Check
+
+```bash
+autorestic check
+```
+
+Checks locations and backends are configured properly and initializes them if they are not already.
+
+This is mostly an internal command, but useful to verify if a backend is configured correctly.