Cleanup of tx raw content from the Hermes guide

[adizere]

Summary

Hermes users should avoid using tx raw (renamed into tx) CLIs, because these are mostly intended for developers and testing. The Hermes guide, however, instructs users to use tx raw at various points, eg to create channel. This can create confusion & can lead users to relying too much on these CLIs.

Proposal

Move the tx related guidelines out of the guide and in a different place. The guide should increasingly be targeting end-users.

Acceptance Criteria

• the Hermes guide focuses on user recipes, not developer use-cases.

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[AlianBenabdallah]

We might propose a new design for the guide. If so, there will be a lot of modifications including tx raw.