llms.txt workflow

[jiangy10]

Added two GitHub Actions workflows that automatically generate and commit an llms.txt file whenever content under src/pages/ changes in a PR. This follows the llms.txt standard to make our documentation discoverable by LLMs. Similar to other PR writing bot, these workflows use artifact to pass through the generated documents and PR credentials for security and private repo permission concerns in PR created by forked repo.

generate-llms-txt.yml

• download the llms-txt-generator scripts from scripts repo
• run the generator to generate llms.txt
• passes llms.txt and PR related info to commit-llms-txt.yml

commit-llms-txt.yml

• get the data from artifact
• push the generated txt with an additional commit to the PR who triggered these 2 workflow