fix mcaptcha on docker compose.
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What does this PR do? (Please give us a brief description of what this PR does.)
i'm making docs for mcaptcha.
this adds some necessary changes to the mcaptcha docker compose, some weird choices like "MCAPTCHA_allow_registration: true" (which is already default true) is being done so that i can advise the user to easily turn it off after configuration in the docs.
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