Update README badges and artifact name, and refine Konan cache configuration

- Replace the GitHub tag badge with a Maven Central version badge in `README.md`
- Update the implementation dependency string in the documentation to use the correct artifact ID `sp24-kt`
- Upgrade `actions/cache` from v4.2.3 to v5 in the `setup-project` action
- Add `restore-keys` to the Konan cache configuration to improve cache hit rates

Author: Julius-Babies

.github/actions/setup-project/action.yaml

@@ -10,10 +10,11 @@ runs:
   using: "composite"
   steps:
     - name: Cached konan
-      uses: actions/cache@v4.2.3
+      uses: actions/cache@v5
       with:
         path: ~/.konan
         key: ${{ runner.os }}-konan-${{ hashFiles('**/*.gradle*') }}-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties') }}
+        restore-keys: ${{ runner.os }}-konan-
 
     - name: Prepare JDK
       uses: actions/setup-java@v5.2.0

README.md

@@ -1,7 +1,8 @@
 # SP24.kt
 
 [![Gradle Test & Publish](https://github.com/VPlanPlus-Project/SP24.kt/actions/workflows/publish.yaml/badge.svg)](https://github.com/VPlanPlus-Project/SP24.kt/actions/workflows/publish.yaml)
-![Current version](https://img.shields.io/github/v/tag/VPlanPlus-Project/SP24.kt?style=flat&label=Current%20version)
+![Maven Central Version](https://img.shields.io/maven-central/v/plus.vplan.lib/sp24-kt?strategy=highestVersion&style=flat-square&label=Current%20version)
+
 
 
 
@@ -26,7 +27,7 @@ Checkout the [latest release](https://github.com/VPlanPlus-Project/SP24.kt/relea
 this version number in your `libs.versions.toml` or `build.gradle.kts`:
 
 ```kotlin
-implementation("plus.vplan.lib:sp24:VERSION")
+implementation("plus.vplan.lib:sp24-kt:VERSION")
 ```
 
 # Using the library