Add Page Titles Everywhere (#177)

Add page titles everywhere

Add global mixin to set page title

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/177

src/App.vue

@@ -419,6 +419,8 @@
 				}
 			},
 			doStuffAfterRoute(e) {
+				// this.setTitle('') // Reset the title if the page component does not set one itself
+
 				if (this.$store.state[IS_FULLPAGE]) {
 					this.$store.commit(IS_FULLPAGE, false)
 				}