dev: fix deadlinks & add CI checker

.github/workflows/link-check.yml

@@ -0,0 +1,19 @@
+name: Check Markdown links
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Install markdown-link-check
+        run: |
+          npm install -g markdown-link-check
+      - name: Run markdown-link-check
+        run: |
+          find src -name "*.md" | xargs markdown-link-check

src/custom_types/enum.md

@@ -24,4 +24,4 @@ want to rename it.
 
 [match]: ../flow_control/match.md
 [fn]: ../fn.md
-[str]: ../core/bytearray.md
+[str]: ../core/bytearrays.md

src/error/option_unwrap.md

@@ -27,4 +27,4 @@ controlled result while retaining the option to `panic` if desired.
 {{#include ../../listings/error/option_unwrap/src/lib.cairo}}
 ```
 
-[expect]: https://docs.cairo-lang.org/std/option/enum.Option.html#method.expect
+[expect]: https://docs.cairo-lang.org/core/core-option-OptionTrait.html#expect

src/hello.md

@@ -32,4 +32,4 @@ Hello World!
 I'm a Caironaut!
 ```
 
-[macros]: macros.md
+[macros]: https://book.cairo-lang.org/ch12-05-macros.html?#macros

src/hello/print.md

@@ -37,8 +37,8 @@ for these types. To print text for custom types, more steps are required.
 [`std::fmt`][fmt], [`macros`][macros], [`struct`][structs], [`traits`][traits]
 
 [fmt]: https://docs.swmansion.com/scarb/corelib/core-fmt.html
-[macros]: ../macros.md
-[bytearray]: ../core/bytearray.md
+[macros]: https://book.cairo-lang.org/ch12-05-macros.html?#macros
+[bytearray]: ../core/bytearrays.md
 [structs]: ../custom_types/structs.md
 [traits]: https://docs.swmansion.com/scarb/corelib/core-fmt.html#traits
 [attribute]: ../attribute.md

src/hello/print/print_display.md

@@ -51,7 +51,7 @@ Debug: Complex { real: 3, imag: 7 }
 
 [derive]: ../../trait/derive.md
 [fmt]: https://docs.swmansion.com/scarb/corelib/core-fmt.html
-[macros]: ../../macros.md
+[macros]: https://book.cairo-lang.org/ch12-05-macros.html?#macros
 [structs]: ../../custom_types/structs.md
 [traits]: ../../trait.md
 [use]: ../../mod/use.md

src/testing/dev_dependencies.md

@@ -22,5 +22,5 @@ File `src/lib.cairo`:
 
 [Scarb][scarb] docs on specifying dependencies.
 
-[unit-testing]: testing/unit_testing.md
+[unit-testing]: ./unit_testing.md
 [scarb]: https://docs.swmansion.com/scarb/docs/reference/specifying-dependencies.html

src/testing/unit_testing.md

@@ -59,6 +59,6 @@ with command `scarb test -- --ignored`
 ```
 
 [attribute]: ../attribute.md
-[macros]: ../macros.md
+[macros]: https://book.cairo-lang.org/ch12-05-macros.html?#macros
 [mod]: ../mod.md
 [panic]: ../error/panic.md