dnote-cli: remove package.

[ericonr]

Package hasn't been maintained for a long time, upstream is at version
0.12.0. Even upstream's move to Go modules didn't lead to an update.

@Vaelatern feel free to push an update instead, otherwise I think the package should be removed.

General

• This is a new package and it conforms to the quality requirements

Have the results of the proposed changes been tested?

• I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
• I generally don't use the affected packages but briefly tested this PR