DOC: Add "New Contributors to PyMC" section

[Laks04]

This PR adds a new "New Contributors to PyMC" section to improve onboarding.

• Provides step-by-step guide for beginners
• Includes learning resources and setup instructions
• Improves documentation clarity and accessibility

[Laks04]

Hi! This is my first contribution to PyMC. Please let me know if any changes are needed — I’d be happy to update the PR. Thank you!

[read-the-docs-community]

Documentation build overview

📚 pymc | 🛠️ Build #31915995 | 📁 Comparing d4f5b56 against latest (6c48a0b)

🔍 Preview build

Show files changed (15 files in total): 📝 15 modified | ➕ 0 added | ➖ 0 deleted

File	Status
glossary.html	📝 modified
contributing/index.html	📝 modified
api/generated/pymc.draw.html	📝 modified
api/generated/pymc.icdf.html	📝 modified
api/generated/pymc.logcdf.html	📝 modified
api/generated/pymc.logp.html	📝 modified
api/generated/pymc.sample_posterior_predictive.html	📝 modified
api/generated/pymc.sample_prior_predictive.html	📝 modified
_modules/pymc/distributions/distribution.html	📝 modified
_modules/pymc/logprob/basic.html	📝 modified
_modules/pymc/model/core.html	📝 modified
_modules/pymc/sampling/forward.html	📝 modified
_modules/pymc/smc/sampling.html	📝 modified
api/distributions/generated/classmethods/pymc.SymbolicRandomVariable.update.html	📝 modified
api/model/generated/classmethods/pymc.model.core.Model.compile_fn.html	📝 modified

[Laks04]

Hi! Just following up on this PR. Please let me know if any changes are needed or if I should update the branch. Thank you!

[ricardoV94]

Hi! This is my first contribution to PyMC. Please let me know if any changes are needed — I’d be happy to update the PR. Thank you!

This is going to be hard without having interacted with at least one developer for finding shared ground

[Laks04]

Hi! Thank you for your feedback.

I understand your point — I should have interacted with the team before opening the PR. I picked this up from issue #6492 with the intention of improving the onboarding experience for new contributors.

I’d really appreciate your guidance on whether this direction aligns with the project’s expectations, and what changes or structure you would prefer. I’m happy to revise the PR accordingly.

Thanks again for your time and support!