docs(www): add llms.txt files

[jdegand]

PR Checklist

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• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[X] Other... Please describe: AI context metadata

What is the current behavior?

There are no LLMS.txt files to help AI tools.

Partially #4804

What is the new behavior?

Expose LLMS.txt on new docs site.

The llms-full.txt file contains mostly all markdown content files from the www folder. I removed some architecture entries that have no real content. I used gitingest.com and removed the extra file headers it adds. The full file is very large. I removed some repeated stuff in the markdown files like the maintenance mode warning of the data package and the recommendation to use signals store. Things like recommendations are likely better suited to a cursor rules or something similar. I put the files in the public folder of the www folder. The NgRx docs doesn't have a public folder and I guess that stuff is getting removed so I decided to just add this to the new docs.

Does this PR introduce a breaking change?

[ ] Yes
[X] No

Other information

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[timdeschryver]

@markgoho is this what you had in mind?
@jdegand if possible, it would be a nice to have to also automate this task. Do you think that's possible?

[jdegand]

@timdeschryver There is a website called firecrawl that provides an endpoint to get llms files. Potentially, you could setup a monthly API request to get a new file. Also, you would need to vet security of using this.

Looking at GitHub action solutions:

• merge-markdown

name: Merge Markdown Files

on:
  push:
    branches: [main]
    paths:
      - 'projects/www/src/app/pages/guide/**/*.md'

jobs:
  merge:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Install merge-markdown
        run: npm install -g @knennigtri/merge-markdown
      - name: Merge files
        run: merge-markdown -i projects/www/src/app/pages/guide/*.md -o projects/www/public/llms-full.txt

• markdown-autodocs
  • This seems more suited to getting specific sections of files versus the full file.

Note: the workflow code needs to be slightly tweaked to commit newly created file back to the main branch.

[jdegand]

I should mention that using the markdown itself in the llms-full.txt file shouldn't trip up the AI (having app-code-example inside the txt file versus backticks with ts).