feat: add url-scheme link to task in Things (#16)

This adds a link to the task in Things itself via the url-scheme link:
- [x] [Task title](things:///show?id=FCkSLvZ3FSKM7vxkDhjip7)

This lets you click on the link and open the Things to the task itself.

src/renderer.ts

@@ -25,8 +25,10 @@ export class LogbookRenderer {
       .map((tag) => `#${prefix}${tag}`)
       .join(" ");
 
+    const taskTitle = `[${task.title}](things:///show?id=${task.uuid}) ${tags}`.trimEnd()
+
     return [
-      `- [x] ${task.title} ${tags}`.trimEnd(),
+      `- [x] ${taskTitle}`,
       ...String(task.notes || "")
         .trimEnd()
         .split("\n")