digital_comms adoption scenario data should be included in data on FTP

[willu47]

The adoption scenarios should be included in the digital comms data folder which is used to setup nismod2. The contents should look something like this:

digital_comms
  - dimensions
    - distribution_points.csv
    - exchanges.csv
  - parameters
    - default.csv
  - processed
    - assets_cabinets.csv
    - ...
  - scenarios
    - fttdp_baseline_adoption.csv
    - ...