update readme and markdown snippets

.vscode/markdown.code-snippets

@@ -62,7 +62,7 @@
 		"prefix": "extra",
 		"body": [
 			"## Extra: $0",
-			"<!-- _backgroundColor: #5d275d -->",
+			"<!-- _class: extra -->",
 		],
 		"description": "Extra slide colors"
 	},
@@ -71,7 +71,7 @@
 		"prefix": "exercise",
 		"body": [
 			"## Exercise $0.",
-			"<!-- _backgroundColor: #29366f -->",
+			"<!--_class: exercise -->",
 		],
 			"description": "Exercise slide colors"
 	},

README.md

@@ -4,11 +4,6 @@ Material completion denoted with 🌑🌘🌗🌖🌕 .
 
 |    # | Lecture                               | Materials | Exercises |
 | ---: | ------------------------------------- | --------: | --------: |
-|    1 | [Example Lecture](example-lecture.md) |         🌕 |         🌕 |
+|    13 | [Generics, IEnumberable and LINQ](13.%20Generics,%20IEnumerable%20and%20LINQ.md) |         🌕 |         🌕 |
-
+|    14 | [Exceptions, Threads and Tasks](14.%20Exceptions,%20Threads%20and%20Tasks.md) |         🌕 |         🌕 |
-
+|    15 | [Design Patterns in C#](15.%20Design%20Patterns%20in%20C#.md) |         🌗 |         🌑 |
-## Repository notes (remove before publishing)
-
-- After reading, remove [example-lecture.md](./example-lecture.md), [example-lecture-slides.html](./example-lecture-slides.html) and [buuttilogo.png](./imgs/buuttilogo.png)
-- See [Markdown code snippets](.vscode/markdown.code-snippets) for autocomplete stuff.
-- Remove the .gitkeep files from imgs and solutions folders after adding new files to those folders.