Add local develop & deploy environment guide

[godvmxi]

* Modify default docs directory from build to doc, easy to edit
   online and preview
* Add requrements.txt to standardize the Python package management
* Modify the Dockerfile to adapt the above changes

If this PR is related to coding or code translation, please fill out the checklist and paste the console outputs to the PR.

• [x] I've tested the code and ensured the outputs are the same as the outputs of reference codes.
• [x] I've checked the codes (formatting, comments, indentation, file header, etc) carefully.
• [x] The code does not rely on a particular environment or IDE and can be executed on a standard system (Win, macOS, Ubuntu).

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
hello-algo	⬜️ Ignored (Inspect)			Jun 6, 2023 3:10am

[krahets]

Thanks for the PR! I'm afraid that the PR breaks the build workflow. If you want to make a local development tutorial, please add it without modifying the build setting.