Fix Colab links: point to blank notebooks, not variant interpretation

- Run Your First Skill: was linking to variant interpretation notebook,
  now links to blank Colab with instructions to copy code from the page
- Build a Skill: added Colab button (was missing entirely)
- GWAS Workshop: added Colab button (was missing)
- All three tutorials now have clear "How to follow along" instructions

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: manuelcorpas

docs/tutorials/build-a-skill.md

@@ -12,8 +12,10 @@ description: Create a complete ClawBio skill from scratch in Google Colab — SK
 
 **No installation required.** This tutorial runs entirely in Google Colab. You will create a complete ClawBio skill: write the SKILL.md contract, add a Python implementation, create demo data, and validate everything works.
 
-!!! tip "Also works locally"
-    Every code cell below works in a terminal too. Just remove the `!` prefix and `%%writefile` magic.
+[:material-open-in-new: Open a new Google Colab notebook](https://colab.research.google.com/#create=true){ .md-button .md-button--primary }
+
+!!! tip "How to follow along"
+    Open a blank Google Colab notebook using the button above, then copy and paste each code block into a new cell. Click the play button to run each cell in order. The `%%writefile` magic creates files directly in Colab. Every command also works in a local terminal if you remove the `!` prefix and use a text editor instead of `%%writefile`.
 
 ---
 

docs/tutorials/gwas-workshop.md

@@ -12,8 +12,9 @@ description: Run a complete GWAS analysis with ClawBio in Google Colab. Variant
 
 **No installation. No terminal. No API keys. No cost.** Everything runs in your browser via Google Colab. All you need is a Google account.
 
-[:material-presentation-play: View slides](https://clawbio.ai/workshop-gwas-slides.html){ .md-button .md-button--primary }
-[:material-open-in-new: Previous workshop: Variant Interpretation](variant-interpretation-workshop.md){ .md-button }
+[:material-open-in-new: Open a new Google Colab notebook](https://colab.research.google.com/#create=true){ .md-button .md-button--primary }
+[:material-presentation-play: View slides](https://clawbio.ai/workshop-gwas-slides.html){ .md-button }
+[:material-arrow-left: Previous workshop: Variant Interpretation](variant-interpretation-workshop.md){ .md-button }
 
 !!! tip "Runs in Google Colab"
     All code in this workshop runs in Google Colab. Open a new notebook, clone ClawBio (`!git clone https://github.com/ClawBio/ClawBio.git` then `%cd ClawBio` and `!pip install -q -r requirements.txt`), and follow along.

docs/tutorials/run-your-first-skill.md

@@ -12,10 +12,10 @@ description: Run a ClawBio skill demo in Google Colab — no installation, no te
 
 **No installation. No terminal. No cost.** Everything runs in your browser via Google Colab. All you need is a Google account.
 
-[:material-open-in-new: Launch in Google Colab](https://colab.research.google.com/github/ClawBio/ClawBio/blob/main/docs/tutorial-variant-interpretation.ipynb){ .md-button .md-button--primary }
+[:material-open-in-new: Open a new Google Colab notebook](https://colab.research.google.com/#create=true){ .md-button .md-button--primary }
 
-!!! tip "Also works locally"
-    Prefer to run on your own machine? Every code cell below works in a terminal too. Just remove the `!` prefix.
+!!! tip "How to follow along"
+    Open a blank Google Colab notebook using the button above, then copy and paste each code block from this page into a new cell. Click the play button to run each cell in order. Every command below also works in a local terminal if you remove the `!` prefix.
 
 ---