Move casts to better subfolder (#63)

docs/demos.md

@@ -3,22 +3,22 @@ Demos taken with [asciinema](https://asciinema.org/).
 
 # No-op
 
-A no-op, where the configuration is already in sync with the remote Gitea instance ([raw cast](./no-op.cast)):
-![No-op update demo](./no-op.svg)
+A no-op, where the configuration is already in sync with the remote Gitea instance ([raw cast](./casts/no-op.cast)):
+![No-op update demo](./casts/no-op.svg)
 
 
 # Repo creation
 
-Create a repo by adding an appropriate entry in config ([raw cast](./on-creation.cast)):
-![Repo creation demo](./on-creation.svg)
+Create a repo by adding an appropriate entry in config ([raw cast](./casts/on-creation.cast)):
+![Repo creation demo](./casts/on-creation.svg)
 
 # Repo update
 
-Make a change to that repo by editing some of its fields in the config file ([raw cast](./update.cast)):
-![Repo update demo](./update.svg)
+Make a change to that repo by editing some of its fields in the config file ([raw cast](./casts/update.cast)):
+![Repo update demo](./casts/update.svg)
 
 # Repo deletion
 
-Delete the repo by setting its `"deleted"` field to `true` ([raw cast](./deletion.cast)):
-![Repo deletion demo](./deletion.svg)
+Delete the repo by setting its `"deleted"` field to `true` ([raw cast](./casts/deletion.cast)):
+![Repo deletion demo](./casts/deletion.svg)