some fixes + adds missing files

src/frontend/app.tsx

@@ -10,7 +10,7 @@ import {demo_Corr_description, getDemoCorr} from "./demo_corr";
 import {demo_BM_description, getDemoBM} from "./demo_bm";
 import {Styledtabs} from "./styledtabs";
 import {demo_Editor_description, getDemoEditor} from "./demo_editor";
-import {demo_Welcome_description, getWelcome} from "./welcome";
+import {demo_Welcome_description, getWelcome} from "./demo_welcome";
 
 export function getApp() {
     const Welcome = getWelcome();

src/frontend/welcome.tsx

@@ -28,8 +28,8 @@ export const demo_Welcome_description =
             This demo site performs two tasks:
         </Text>
         <List type="ordered">
-            <List.Item>the possibilities of the approach are presented and</List.Item>
-            <List.Item>by the step-by-step structure, the understanding of our approach will be made easier.</List.Item>
+            <List.Item>Presenting the possibilites of our approach.</List.Item>
+            <List.Item>Improving the understandability by example walk-throughs.</List.Item>
         </List>
         <Text>
             In our explanations of the different views we use the following blocks:

src/frontend/index.css

@@ -24,6 +24,10 @@ html,body, #root {
   }
 }
 
+.mantine-List-item {
+    font-size: 14px;
+}
+
 .mantine-Text-root + .mantine-Text-root {
     margin-bottom: 10px;
 }