delete old docs (#327)

* delete old docs

* new docs

docs/pages/migration/0.x_1.0.md

@@ -0,0 +1,24 @@
+# From `0.x` to `1.0`
+
+Most of the config file is remained compatible, however to clean up the backends custom environment variables were moved from the root object to an `env` object.
+
+```yaml
+# Before
+remote:
+    type: b2
+    path: bucket:path/to/backup
+    key: some random encryption key
+    B2_ACCOUNT_ID: id
+    B2_ACCOUNT_KEY: key
+
+# After
+remote:
+    type: b2
+    path: bucket:path/to/backup
+    key: some random encryption key
+    env:
+      B2_ACCOUNT_ID: id
+      B2_ACCOUNT_KEY: key
+```
+
+Other than the config file there is a new `-v, --verbose` flag which shows the output of native commands, which are now hidden by default.