Bugfixes and enhance zkEVM demo

[wyhaines]

Fix a couple bugs in the codeblock implementation, and switch the local zkevm demo page to use it, with trimming of the text to be cut and pasted to avoid pasting things other than the command to run.

Description

Change the code blocks so that instead of this:

which, on a copy, gets all of the extra non-command stuff, like the $ at the start of a line, or the <tx_hash>, or all of the extraneous command output, to this:

where the 'Copy' button only copies the topos-zkevm-demo generate merkle-proof or the topos-zkevm-demo generate merkle-proof 0x785102ca9881b284588452cd90685d2c713cf61f6e4f3fcc8451bb6f2a571130, respectively.

Similar changes are applied to all of the code blocks. This dramatically improves the user experience of going through the demo, as people can copy and paste from the content in the developer docs without having to manually edit every line that they copy before running it.

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works

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