Add comments and documentation, replace angle brackets in CLI documentation · microsoft/genaiscript@ce8f277

HTML entities should not be used in markdown files; replace '<' with '<' and '>' with '>'.

HTML entities should not be used in markdown files; replace '<' with '<' and '>' with '>'.

Incorrect code fence 'sh' should be 'shell' for consistency with the rest of the documentation.

Incorrect variable access, 'env.vars.build' should be 'env.vars' to access 'format' and 'build' variables correctly.

Incorrect flag format, use '--vars.build="npm run build"' and '--vars.format="npm run format"' instead of the current format.

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