Adds automated link checking and fixes broken links (#15)

# Adds automated link checking and fixes broken links

## ♻️ Current situation & Problem
This PR adds automated link checking of all markdown files and fixes
broken links. The check will run on all pull requests and automatically
on the first of each month at midnight.

## 📝 Code of Conduct & Contributing Guidelines 

By submitting creating this pull request, you agree to follow our [Code
of
Conduct](https://github.com/StanfordSpezi/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordSpezi/.github/blob/main/CONTRIBUTING.md):
- [X] I agree to follow the [Code of
Conduct](https://github.com/StanfordSpezi/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordSpezi/.github/blob/main/CONTRIBUTING.md).

.github/workflows/monthly-markdown-link-check.yml

@@ -0,0 +1,19 @@
+#
+# This source file is part of the Stanford Spezi open source project
+#
+# SPDX-FileCopyrightText: 2023 Stanford University and the project authors (see CONTRIBUTORS.md)
+#
+# SPDX-License-Identifier: MIT
+#
+
+name: Monthly Markdown Link Check
+
+on:
+  # Runs at midnight on the first of every month
+  schedule:
+    - cron: "0 0 1 * *"
+
+jobs:
+  markdown_link_check:
+    name: Markdown Link Check
+    uses: StanfordBDHG/.github/.github/workflows/markdown-link-check.yml@v2

.github/workflows/pull_request.yml

@@ -19,3 +19,6 @@ jobs:
   swiftlint:
     name: SwiftLint
     uses: StanfordSpezi/.github/.github/workflows/swiftlint.yml@v2
+  markdown_link_check:
+    name: Markdown Link Check
+    uses: StanfordBDHG/.github/.github/workflows/markdown-link-check.yml@v2

README.md

@@ -28,7 +28,7 @@ You need to add the Spezi Storage Swift package to
 [Swift package](https://developer.apple.com/documentation/xcode/creating-a-standalone-swift-package-with-xcode#Add-a-dependency-on-another-Swift-package).
 
 > [!IMPORTANT]
-> If your application is not yet configured to use Spezi, follow the [Spezi setup article](https://swiftpackageindex.com/stanfordspezi/spezi/documentation/spezi/setup) to set up the core Spezi infrastructure.
+> If your application is not yet configured to use Spezi, follow the [Spezi setup article](https://swiftpackageindex.com/stanfordspezi/spezi/documentation/spezi/initial-setup) to set up the core Spezi infrastructure.
 
 You can configure the [`LocalStorage`](https://swiftpackageindex.com/stanfordspezi/spezistorage/documentation/spezilocalstorage/localstorage) or [`SecureStorage`](https://swiftpackageindex.com/StanfordSpezi/SpeziStorage/documentation/spezisecurestorage) module in the [`SpeziAppDelegate`](https://swiftpackageindex.com/stanfordspezi/spezi/documentation/spezi/speziappdelegate).
 ```swift

Sources/SpeziLocalStorage/SpeziLocalStorage.docc/SpeziLocalStorage.md

@@ -26,7 +26,7 @@ You need to add the Spezi Storage Swift package to
 [your app in Xcode](https://developer.apple.com/documentation/xcode/adding-package-dependencies-to-your-app#) or
 [Swift package](https://developer.apple.com/documentation/xcode/creating-a-standalone-swift-package-with-xcode#Add-a-dependency-on-another-Swift-package).
 
-> Important: If your application is not yet configured to use Spezi, follow the [Spezi setup article](https://swiftpackageindex.com/stanfordspezi/spezi/documentation/spezi/setup) to set up the core Spezi infrastructure.
+> Important: If your application is not yet configured to use Spezi, follow the [Spezi setup article](https://swiftpackageindex.com/stanfordspezi/spezi/documentation/spezi/initial-setup) to set up the core Spezi infrastructure.
 
 You can configure the ``LocalStorage`` module in the [`SpeziAppDelegate`](https://swiftpackageindex.com/stanfordspezi/spezi/documentation/spezi/speziappdelegate).
 

Sources/SpeziSecureStorage/SpeziSecureStorage.docc/SpeziSecureStorage.md

@@ -26,7 +26,7 @@ You need to add the Spezi Storage Swift package to
 [your app in Xcode](https://developer.apple.com/documentation/xcode/adding-package-dependencies-to-your-app#) or
 [Swift package](https://developer.apple.com/documentation/xcode/creating-a-standalone-swift-package-with-xcode#Add-a-dependency-on-another-Swift-package).
 
-> Important: If your application is not yet configured to use Spezi, follow the [Spezi setup article](https://swiftpackageindex.com/stanfordspezi/spezi/documentation/spezi/setup) to set up the core Spezi infrastructure.
+> Important: If your application is not yet configured to use Spezi, follow the [Spezi setup article](https://swiftpackageindex.com/stanfordspezi/spezi/documentation/spezi/initial-setup) to set up the core Spezi infrastructure.
 
 You can configure the ``SecureStorage`` module in the [`SpeziAppDelegate`](https://swiftpackageindex.com/stanfordspezi/spezi/documentation/spezi/speziappdelegate).