LIN-716 Reorganize RTD contents

[yoonspark]

Summary

Based on feedback from external reviewers (primarily Alejandra’s), we want to reorganize our RTD contents such that they provide a smoother onboarding experience for new users. Concretely, we want to reorganize RTD contents into the following sections:

• Concepts: High-level explanation of core concepts in using LineaPy, such as artifacts and pipelines
• Tutorials: Learning-oriented lessons that take the reader by the hand through a series of steps to complete a project of some kind
• Guides: Goal-oriented directions that take the reader through the steps required to solve a real-world problem
• Reference

The objective of this story is NOT to add new contents but rather to reorganize existing ones. New contents shall be added through different stories.

The updated RTD can be previewed at: https://docs.lineapy.org/en/lin-716-reorg-rtd-contents/

Changes

• [x] Reorganize existing contents in RTD into the new structure (outlined above)
• [x] Declutter and streamline tutorial notebooks
• [x] Synchronize tutorial notebooks across different documentation surfaces
• [x] Centralize storage of image files at docs/source/_static/images/

Testing

CI will kick in to evaluate tutorial notebooks.

Ticket(s)

• https://linea.atlassian.net/browse/LIN-716

[yoonspark]

@lionsardesai Could you review this PR? Most changes (i.e., changes in docs/, examples/, and .colab/) are documentation changes, which you can better review in RTD: https://docs.lineapy.org/en/lin-716-reorg-rtd-contents/.

Code changes happened at:

• .github/workflows/sync_notebooks.yml
• requirements.txt
• setup.py
• docs/source/conf.py
• docs/source/_static/js/custom.js

[yoonspark]

Things to be done after this PR is merged to main:

1. Merge main into v0.2.x so that Colab links get updated (Colab is currently pointing to v0.2.x)
2. Update Colab links in each tutorial notebooks (use explicit links, instead of abbreviated ones)