Use a better link checker

.github/.linkspector.yml

@@ -0,0 +1,17 @@
+dirs:
+  - .
+excludedDirs:
+  - workflows
+  - animation
+  - scripts
+aliveStatusCodes:
+  - 200
+  - 206
+  - 403
+ignorePatterns:
+  - pattern: "^https://bazel.build"
+  - pattern: "^https://makefiletutorial.com"
+modifiedFilesOnly: true
+replacementPatterns:
+  - pattern: "<a href=\"https://youtu.be/blah\"></a>"
+    replacement: "[blah](https://blah.blah)"

.github/workflows/action.yml

@@ -7,10 +7,13 @@ jobs:
     name: All Markdown links are valid
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
-    - uses: gaurav-nelson/github-action-markdown-link-check@v1
-      with:
-        config-file: '.github/mcl_config.json'
+     - uses: actions/checkout@v4
+     - name: Run linkspector
+       uses: umbrelladocs/action-linkspector@v1
+       with:
+         reporter: github-pr-review
+         fail_level: any
+         config_file: .github/.linkspector.yml
 
   check-snippet-compilation:
     name: All code snippets compile

lectures/compilation_debugging.md

@@ -35,7 +35,7 @@ Style (🎨) and software design (🎓) recommendations mostly come from [Google
   ```cmd
   c++ -std=c++17 -o test test.cpp
   ```
-- ✅ Enable **most** [warnings](https://gcc.gnu.org/onlinedocs/gcc/gcc-command-options/options-to-request-or-suppress-warnings.html#cmdoption-Wall), treat them as errors:
+- ✅ Enable **most** [warnings](https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wall), treat them as errors:
   `-Wall`, `-Wextra`, `-Wpedantic`, `-Werror`
 - Other warnings possible too:
   `-Wimplicit-fallthrough`, `-Wsign-conversion`, etc.

lectures/cpp_basic_types_and_variables.md

@@ -148,7 +148,7 @@ int main() {
 
 ---
 
-# Always initialize all variables! 🚨
+# Always initialize all variables!
 
 (unless measured slow, stay tuned to a later point in the course)
 <!--

lectures/hello_world_dissection.md

@@ -26,7 +26,7 @@ Hello World!
 ---
 # Here is what we can learn from it
 
-- [Some keywords](hello_world_dissection.md#some-words-and-symbols-are-more-special-than-other-🦄) like `return` or `int` _(and many more!)_
+- [Some keywords](hello_world_dissection.md#some-words-and-symbols-are-more-special--than-other) like `return` or `int` _(and many more!)_
 - Constants like `"Hello World!"` and `0`
 - [Lots of whitespaces!](hello_world_dissection.md#whitespaces-mostly-play-no-role)
 - [Different brackets:](hello_world_dissection.md#what-are-all-those-brackets-about)  `{}`, `()`, `<>`
@@ -38,7 +38,7 @@ Hello World!
 ## 📺 Watch the related [YouTube video](https://youtu.be/t2h1geGSww4)!
 
 ---
-# Some words and symbols are more special🦄 than other
+# Some words and symbols are more special 🦄 than other
 - In the code above, some words and symbols are highlighted
 - This is done by **parsing** the language into meaningful parts
 - Whitespaces and symbols **separate** these parts

lectures/templates_why.md

@@ -2,7 +2,7 @@ Why use templates?
 ---
 
 <p align="center">
-  <a href="https://youtu.be/1Mrt1NM3KnI"><img src="https://img.youtube.com/vi/1Mrt1NM3KnI/maxresdefault.jpg" alt="Video" align="right" width=50% style="margin: 0.5rem"></a>
+  <a href="https://youtu.be/blah"><img src="https://img.youtube.com/vi/blah/maxresdefault.jpg" alt="Video" align="right" width=50% style="margin: 0.5rem"></a>
 </p>
 
 - [Why use templates?](#why-use-templates)
@@ -14,6 +14,7 @@ Why use templates?
 - [Compile-time meta-programming](#compile-time-meta-programming)
 - [Summary](#summary)
 
+<a href="https://blah/blah"></a>
 
 [Templates](https://en.cppreference.com/w/cpp/language/templates) are definitely one of the features that make C++ so popular and powerful. They provide an extremely versatile mechanism to write truly generic code and allow building meaningful abstractions only paying for these benefits with some compilation time and little to no run time!