Configure Thoth to screen posts for uniquiqueness

[remlaps]

It should be possible to use free & paid APIs, via a plagiarism detection service like these:

• https://www.quora.com/What-is-the-best-Plagiarism-Checker-with-free-API

Open source tools like these:

• https://www.edenai.co/post/top-free-plagiarism-detection-tools-apis-and-open-source-models

Or custom Thoth ngram searching using Google or Brave search APIs

• (i.e.) https://brave.com/search/api/

The program should let operators import any API keys from environment variables or save them in the private config file. No keys should be saved in the config.template file.