feat(caldav): add FeedItemRenderer

Implement renderCalDavFeedItem using JRX JSX to render
CalDAV events as FeedCard components. Bump @nym.sh/jrx
to 0.2.0 for null/undefined child support.

Co-authored-by: Ona <no-reply@ona.com>

packages/aelis-source-caldav/tsconfig.json

@@ -0,0 +1,7 @@
+{
+	"extends": "../../tsconfig.json",
+	"compilerOptions": {
+		"jsxImportSource": "@nym.sh/jrx"
+	},
+	"include": ["src"]
+}