feat: Enhance Basilisk101 course content and structure

Improve the course content and structure for the Basilisk101 course in
Madrid. Key changes include:

- Add details on the viscoelastic fluids topic in the Non-Newtonian flows
  section, including a new working assignment.
- Restructure the Special Topics section to focus on Three-phase flows,
  Holey Sheets, and Contact line dynamics.
- Provide more context and links to the working assignments throughout
  the schedule.
- Clarify and expand the descriptions for various lecture and hackathon
  sessions.

Author: VatsalSy

_teaching/2025-Basilisk101-Madrid.md

@@ -78,18 +78,21 @@ The course combines theoretical lectures with extensive hands-on sessions, allow
 - **10:00-11:30**  |  **Lecture (1a)**
   - Conservation laws and the numerical solution of the Navier–Stokes equations
 - **11:45-13:00**  |  **Lecture (1b)**
-  - Advection-diffusion, diffusion-reaction, and other transport equations
+  - Transport equations
   - *Brief intro to Basilisk coding framework*
 
 #### First coding steps
 - **15:00-18:00**  |  **Hybrid Session**
-  - Implementing basic transport equations in Basilisk C
+  - Implementing basic transport equations in Basilisk C.
+  - Using headers in Basilisk, modular code structure, problem setup, and compilation
   - *Whiteboard + coding*
+  - [1st Working Assignment](https://blogs.comphy-lab.org/Lecture-Notes/Basilisk101/1st-workingAssignment)
 
 ### Tuesday: Advanced Implementation
 #### Coding like a pro
 - **10:00-11:15**  |  **Hackathon (1c)**
-  - Using headers in Basilisk, modular code structure, problem setup, and compilation
+  - Solving Navier–Stokes equations in Basilisk C. 
+  - [2nd Working Assignment](https://blogs.comphy-lab.org/Lecture-Notes/Basilisk101/2nd-workingAssignment)
 - **11:30-13:00**  |  **Hackathon Continued**
   - Expanding on the morning tasks and code debugging
 
@@ -98,26 +101,29 @@ The course combines theoretical lectures with extensive hands-on sessions, allow
 - **10:00-11:30**  |  **Lecture (2a)**
   - Interface tracking methods (VoF, level set, phase-field approaches) and numerical strategies
 - **11:45-13:00**  |  **Hackathon (2b)**
-  - Hands-on tutorial applying interface-tracking to a simple two-phase problem
+  - Hands-on tutorial with interface-tracking to a simple two-phase problem
+  - [3rd Working Assignment](https://blogs.comphy-lab.org/Lecture-Notes/Basilisk101/3rd-workingAssignment)
 
 #### Seminar
 - **13:30-14:00**  |  **Department seminar (2c)**
   - A note on the thrust of airfoils by [José Manuel Gordillo](https://scholar.google.com/citations?user=14wOsewAAAAJ&hl=en&inst=5726176096060060532&oi=ao)
 
 #### Non-Newtonian flows
 - **15:00-16:00**  |  **Lecture (3a)**
-  - Non-Newtonian flows: viscoplasticity and viscoelasticity
+  - Non-Newtonian flows: viscoelasticity.
 - **16:15-18:00**  |  **Hackathon (3b)**
-  - Coding exercises for shear-thinning, viscoplastic, or viscoelastic fluids
+  - Coding exercises for viscoelastic fluids.
+  - [4th Working Assignment](https://blogs.comphy-lab.org/Lecture-Notes/Basilisk101/4th-workingAssignment)
 
 ### Thursday: Special Topics
 #### Special topics
 - **10:00-11:30**  |  **Lecture (4a)**
-  - Special Topics: multilayer solver, lubrication equation, Marangoni flows, manifold death, and research-oriented examples
+  - Review and catching up on [4th Working Assignment](https://blogs.comphy-lab.org/Lecture-Notes/Basilisk101/4th-workingAssignment).
+  - Special Topics: Three-phase flows, 
 - **11:45-13:00**  |  **Hackathon (4b)**
-  - Focused tutorials on the special topics introduced in the lecture
+  - Special Topics: Holey Sheets, Contact line dynamics. 
 - **15:00-16:30**  |  **Lecture (4c)**
-  - Open discussion, deeper dives into advanced features, final code reviews, and next steps
+  - Open discussion, deeper dives into advanced features, final code reviews, and next steps.
 
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