infra: remove stale dockerfiles from repo

[efriis]

deleting the following docker things from monorepo. they aren't currently usable because of old dependencies, and I'd rather avoid people using them / having to maintain them

• /docker
  • this folder has a compose file that spins up postgres,pgvector (separate from postgres and very stale version),mongo instance with default user/password that we've gotten security pings about before. not worth having
  • also spins up a custom dockerfile with onttotext/graphdb - not even sure what that is
• /libs/langchain/dockerfile + dev.dockerfile
  • super old poetry version, doesn't implement the right thing anymore
• .github/workflows/_release_docker.yml, langchain_release_docker.yml
  • not used anymore, not worth having an alternate release path

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1 Skipped Deployment

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **langchain** | ⬜️ Ignored ([Inspect](https://vercel.com/langchain/langchain/95AhtyUjfQWn3eki3M8d3m4bx3i2)) | [Visit Preview](https://langchain-git-erick-infra-remove-stale-dockerf-874482-langchain.vercel.app) | | Nov 20, 2024 11:58pm |