Merge remote-tracking branch 'origin/699-node-graph-display-the-graph-toolbar-by-default-il-would-make-it-possible-to-control-more-quickly-play-pause' into dev

bin/install revised with --extra-experimental-features nix-command --extra-experimental-features to allow compilation

Now everything uses a nix flake

Merge remote-tracking branch 'origin/691-node-terms-in-settings-on-the-download-tab-put-json-as-default-selectbox-choice-instead-of-the-current-json-zipped' into dev