Update Permutation and Combination cheatsheets. (#963)

src/algorithms/sets/combinations/README.md

@@ -50,19 +50,17 @@ Where `n` is the number of things to choose from, and we
 choose `r` of them. Repetition allowed,
 order doesn't matter.
 
-## Cheat Sheets
+## Cheatsheet
 
-Permutations cheat sheet
+![Permutations and Combinations Overview](./images/overview.png)
 
-![Permutations Cheat Sheet](https://cdn-images-1.medium.com/max/2000/1*JNK-n0Pt0Vbxk0lxVpgT5A.png)
+![Combinations overview](./images/combinations-overview.jpg)
 
-Combinations cheat sheet
+| | |
+| --- | --- |
+|![Combinations with repetition](./images/combinations-with-repetitions.jpg) | ![Combinations without repetition](./images/combinations-without-repetitions.jpg) |
 
-![Combinations Cheat Sheet](https://cdn-images-1.medium.com/max/2000/1*7cFRn8jW4g_91YgDAbmxRQ.png)
-
-Permutations/combinations algorithm ideas.
-
-![Algorithms Idea](https://cdn-images-1.medium.com/max/2000/1*vLsSsZMnesCFPCYTYMbxrQ.png)
+*Made with [okso.app](https://okso.app)*
 
 ## References
 

src/algorithms/sets/permutations/README.md

@@ -37,19 +37,17 @@ For example the the lock below: it could be `333`.
 n * n * n ... (r times) = n^r
 ```
 
-## Cheat Sheets
+## Cheatsheet
 
-Permutations cheat sheet
+![Permutations and Combinations Overview](./images/overview.png)
 
-![Permutations Cheat Sheet](https://cdn-images-1.medium.com/max/2000/1*JNK-n0Pt0Vbxk0lxVpgT5A.png)
+![Permutations overview](./images/permutations-overview.jpeg)
 
-Combinations cheat sheet
+| | |
+| --- | --- |
+|![Permutations with repetition](./images/permutations-with-repetitions.jpg) | ![Permutations without repetition](./images/permutations-without-repetitions.jpg) |
 
-![Combinations Cheat Sheet](https://cdn-images-1.medium.com/max/2000/1*7cFRn8jW4g_91YgDAbmxRQ.png)
-
-Permutations/combinations algorithm ideas.
-
-![Algorithms Idea](https://cdn-images-1.medium.com/max/2000/1*vLsSsZMnesCFPCYTYMbxrQ.png)
+*Made with [okso.app](https://okso.app)*
 
 ## References