Update to version 2.2.0-alpha-2 and add database query provider

Bumped project version to `2.2.0-alpha-2` in `build.gradle.kts`. Introduced `SampleEntity`, `SamplePartEntity`, and `SampleEntityQueryProvider` for database handling. Added `SampleDao` with a sample query function. Updated SVG utilities with a `viewbox` extension and enhanced `RequestHandler` to set content type for HTML responses.

src/jsMain/kotlin/nl/astraeus/vst/ui/util/SVGFunctions.kt

@@ -14,6 +14,10 @@ fun SVG.height(height: Int) {
   this.attributes["height"] = "$height"
 }
 
+fun SVG.viewbox(viewbox: String) {
+  this.attributes["viewbox"] = viewbox
+}
+
 fun SVG.svgStyle(
   name: String,
   vararg props: Pair<String, String>