Add disconnection and minor improvements on login page.

frontend/src/app/pages/home/home.component.html

@@ -1 +1 @@
-<p>home works!</p>
+<h1>Welcome to Codiki application!</h1>

frontend/src/app/pages/home/home.component.scss

@@ -0,0 +1,6 @@
+:host {
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    align-items: center;
+}