DOCS: add LLM-friendly files, backend compatibility page, and new-user README path

[svandenb-dev]

This PR keeps the scope coherent:

• better onboarding for humans,
• clearer backend messaging,
• and better AI retrieval/discoverability. PyEDB already has the public docs/release/package surfaces needed for this to work well; this PR mainly improves how the project presents its canonical entry points.

closes #1971

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.87%. Comparing base (5cbae21) to head (b1fb93e).
⚠️ Report is 61 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1970       +/-   ##
===========================================
- Coverage   70.20%   48.87%   -21.34%     
===========================================
  Files         261      263        +2     
  Lines       42416    43009      +593     
===========================================
- Hits        29779    21019     -8760     
- Misses      12637    21990     +9353     

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[SMoraisAnsys]

Adding request changes to avoid merging before discussions on this topic occurs. Should be performed next week if possible

[codacy-production]

Up to standards ✅

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[eblanco-ansys]

As discussed, IMO it would make more sense to put those files in doc/source directly, to let the crawlers access them more easily

[SMoraisAnsys]

If the goal is that those file get used afterward (by crawlers for example), shouldn't we try another approach ? I'm not sure if there is a standard to this or not (AI related)

[svandenb-dev]

If the goal is that those file get used afterward (by crawlers for example), shouldn't we try another approach ? I'm not sure if there is a standard to this or not (AI related)

If the goal is that those file get used afterward (by crawlers for example), shouldn't we try another approach ? I'm not sure if there is a standard to this or not (AI related)

If the goal is that those file get used afterward (by crawlers for example), shouldn't we try another approach ? I'm not sure if there is a standard to this or not (AI related)

It is a standard but we an discuss later.

[eblanco-ansys]

If the goal is that those file get used afterward (by crawlers for example), shouldn't we try another approach ? I'm not sure if there is a standard to this or not (AI related)

I did some research yesterday and generally this llms.txt file is stored at the root of the documentation webpage