Add the rest of university notes

docs/lectures/osc/07_concurrency4.md

@@ -2,7 +2,7 @@
 
 ## The Dining Philosophers Problem
 
-<img src="/lectures/osc/assets/w.png" alt="img" style="zoom:67%;" />
+<img src="assets/w.png" alt="img" style="zoom:67%;" />
 
 The problem is defined as:
 
@@ -50,7 +50,7 @@ The solution uses:
 > * `sync` : one **semaphore/mutex** to enforce **mutual exclusion** of the critical section (while updating the **states** of `hungry` `thinking` and `eating`)
 > * A philosopher can only **start eating** if their neighbours are **not eating**.
 
-![img](/lectures/osc/assets/x.png)
+![img](assets/X.png)
 
 #### Code for Solution 3