Remove commit from internal wallet

[v0d1ch]

Why

We would to remove the old way of committing funds to a Head.

What

We already deprecated the use of the commit from internal workflow via the Commit client input message (websocket). Now we want to remove that capability complete and also drop mentions of marking fuel as that is not needed anymore. Any commit to a hydra node should be done via the #215 workflow.

How

Make sure we are using only external commits everywhere:

• Remove Commit client input and related code so that there is no option for the clients to commit using a websocket message.
• Grep the code base for the word fuel and remove all occurrences in the documentation/code comments. make sure that it's clear that any funds held by the internal wallet are fuel. No mentions of "marking fuel" remain in the docs.
• Propagate internal commit changes in the hydra-tui package
• Inspect our shell scripts and make sure they are updated
• Demo video is not related anymore, record a new one?

[pgrange]

We should first do #966 so that existing clients don't have to implement a direct cardano-node connection after this change.

[ch1bo]

Not required for 0.12.0 if not done in time.