Temporary: move static files into content

During migration, while we launch Redocly with -d content, the static
files need to be in content. Eventually, when we stop using -d, we need
to move the files again.

Previously:
/assets : static assets used by templates
/img : images used in documentation (mostly)

Now:
/content/static : static assets used by templates
/img : images used in documentation (mostly)

Eventually:
/static : static assets used by templates
/docs/img : images used in documentation

content/static/js/contribute-carousel.js

@@ -0,0 +1,78 @@
+let currentIndex = 1;
+
+let isFirstLoad = true; // Add a flag to determine if it's the initial load
+
+function updateCarousel() {
+  const centerImage = document.getElementById("center-image");
+  const leftImage = document.getElementById("left-image");
+  const rightImage = document.getElementById("right-image");
+
+  if (!isFirstLoad) {
+    // Only run the exit animation if it's not the first load
+    centerImage.classList.add("exit");
+    leftImage.classList.add("exit");
+    rightImage.classList.add("exit");
+  }
+
+  setTimeout(
+    () => {
+      if (events[currentIndex - 1]) {
+        document.getElementById("prev-btn").style.opacity = 1;
+        leftImage.style.visibility = "visible";
+        leftImage.src = `assets/img/events/${events[currentIndex - 1].image}`;
+      } else {
+        document.getElementById("prev-btn").style.opacity = 0.5;
+        leftImage.style.visibility = "hidden";
+      }
+
+      centerImage.src = `assets/img/events/${events[currentIndex].image}`;
+      centerImage.onclick = function() { // Add an onclick event to the main image
+        window.open(events[currentIndex].link, '_blank'); // Open a new tab with the event link
+      };
+
+      if (events[currentIndex + 1]) {
+        document.getElementById("next-btn").style.opacity = 1;
+        rightImage.style.visibility = "visible";
+        rightImage.src = `assets/img/events/${events[currentIndex + 1].image}`;
+      } else {
+        document.getElementById("next-btn").style.opacity = 0.5;
+        rightImage.style.visibility = "hidden";
+      }
+
+      document.getElementById("event-name").textContent =
+        events[currentIndex].name;
+      document.getElementById("event-location").textContent =
+        events[currentIndex].location;
+      document.getElementById("event-date").textContent =
+        events[currentIndex].date;
+
+      if (!isFirstLoad) {
+        // Only run the enter animation if it's not the first load
+        centerImage.classList.remove("exit");
+        leftImage.classList.remove("exit");
+        rightImage.classList.remove("exit");
+      }
+    },
+    isFirstLoad ? 0 : 700
+  ); // If it's the first load, update immediately; otherwise, wait for the transition
+
+  // After the initial setup, set isFirstLoad to false
+  isFirstLoad = false;
+}
+
+document.getElementById("prev-btn").addEventListener("click", function () {
+  if (currentIndex > 0) {
+    currentIndex--;
+    updateCarousel();
+  }
+});
+
+document.getElementById("next-btn").addEventListener("click", function () {
+  if (currentIndex < events.length - 1) {
+    currentIndex++;
+    updateCarousel();
+  }
+});
+
+// Initial setup
+updateCarousel();