Further encouragement to use python-oracledb.

Further nudge users towards python-oracledb.

Relocate file per @LesiaChaban.

Update README.md

Create SECURITY.md

Make samples point to python-oracledb at runtime.

Update templates and READMEs to take note of python-oracledb.

Update README.md

Update CONTRIBUTING.md

Add files via upload

Update ReadTheDocs configuration to avoid deprecation warnings with

Update ReadTheDocs configuration to avoid deprecation warnings with

Add more doc redirects.