fix: Ensure hero heading has minimum distance from fixed nav bar across all languages

- Change .hero from align-items:center to flex-start so content starts from top
- Increase padding-top in short-viewport media query (<=920px height) to
  clamp(7.5rem, 10vh, 9rem) from clamp(3.75rem, 6vh, 5.5rem) so it always
  clears the ~96px nav bar
- Fix pre-existing lint errors: remove unused variables demoFinishedByStory,
  firstTake; add website/www to eslint ignores

website/app.js

@@ -767,8 +767,6 @@ document.addEventListener('DOMContentLoaded', () => {
         let userTookOver = false;
         let demoStarted = false;
         let demoFinished = false;
-        let demoFinishedByStory = false;
-
         const finishDemo = () => {
             if (demoFinished) return;
             demoFinished = true;
@@ -780,7 +778,6 @@ document.addEventListener('DOMContentLoaded', () => {
         };
 
         const takeOver = (e) => {
-            const firstTake = !userTookOver;
             userTookOver = true;
             finishDemo();
             // Clicks outside the popup (and not on its launcher icon) always collapse the popup
@@ -856,7 +853,6 @@ document.addEventListener('DOMContentLoaded', () => {
             if (!await step(progressA, 1300, () => seekTo('a', 0.62), 0.62)) return;
             if (!await step(tabs.a.root, 700)) return;
 
-            demoFinishedByStory = true;
             finishDemo();
         };