Document astro dev --no-lock flag

[matthewp]

Documents the new astro dev --no-lock flag added in withastro/astro#17331.

• Adds a --no-lock reference section under astro dev
• Lists --no-lock in the astro dev help output

[astrobot-houston]

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[yanthomasdev]

LGTM

[ArmandPhilippot]

Mostly a nit regarding formatting (single/two paragraphs as the two statements do not seem to be linked), but I also think it's important to mention what happens when these flags are combined (see my suggestion). Otherwise, LGTM!