Update installation and interface guide of CLI

[vladimirfomene]

Update the instructions in the guide to follow the latest version of the CLI. Remove some information duplication and typos.

@notmandatory, I removed the language specification on the bash command outputs because it will try to highlight anything in the output that looks like code. Like the angle brackets in the sign output below:

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[notmandatory]

I left a few small suggestions but overall this looks good. Thanks for the overdue refresh for this section.

[rajarshimaitra]

ACK 03c8212

Thanks for covering this.. This is compatible with remaining of the pending updates in bdk-cli too.. So its good to go..

Just one small thing that we should also update with this..

Line 20: At the time of writing, the project requires cargo >= 1.46.0, which is our minimum supported rust version (MSRV) as of July 2021. If you have an older version installed with rustup.rs, you can upgrade it with rustup update.

This can be updated now.. Our MSRV in v0.5.0 is 1.56.

[vladimirfomene]

@rajarshimaitra, changed the MSRV to 1.56.0 as recommended

[rajarshimaitra]

Thanks for the update.. This looks good to me now.. Just few more nits here and there..

[notmandatory]

ACK ffcab9e

Looks good to me.