update with duniter version of current gdev network

• remove smith membership metadata
• convert session keys
• update indexer schema
• adapt get_identity to blake_concat
• add change owner key command
• add revoke smith membership command
• fix cesium secret format

res/README.md

+# Resources
+
+## Graphql schema and queries for Duniter indexer
+
+...
+
+## Metadata
+
+To update the scale-encoded Duniter metadata, spawn a node and run the subxt command.
+
+```sh
+# spawn a node listening on localhost:9944
+duniter --dev
+# fetch the metadata with subxt
+subxt metadata -f bytes > res/metadata.scale
+```
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