fix(frontend): Warning for Quivr Assistants (#2479)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

frontend/app/assistants/page.module.scss

@@ -11,4 +11,10 @@
     gap: Spacings.$spacing03;
     flex-wrap: wrap;
   }
+
+  .message_wrapper {
+    display: flex;
+    flex-direction: column;
+    gap: Spacings.$spacing02;
+  }
 }

frontend/app/assistants/page.tsx

@@ -51,16 +51,28 @@ const Search = (): JSX.Element => {
           buttons={[]}
         />
         <div className={styles.content_wrapper}>
-          <div className={styles.message_wrapper}>
-            <MessageInfoBox type="info">
+          <MessageInfoBox type="info">
+            <div className={styles.message_wrapper}>
               <span>
-                Quivr assistants are AI-driven agents that apply specific
-                processes to an input in order to generate a usable output.{" "}
-                <br></br>This output can be directly uploaded to a digital brain
-                or sent via email.{" "}
+                A Quivr Assistant is an AI agent that apply specific processes
+                to an input in order to generate a usable output.
               </span>
-            </MessageInfoBox>
-          </div>
+              <span>
+                For now, you can try the summary assistant, that summarizes a
+                document and send the result by email or upload it in one of
+                your brains.
+              </span>
+              <span> But don&apos;t worry! Other assistants are cooking!</span>
+            </div>
+          </MessageInfoBox>
+          <MessageInfoBox type="warning">
+            <div className={styles.message_wrapper}>
+              <span>
+                <strong>Feature still in Beta.</strong> Please provide feedbacks
+                on the chat below!
+              </span>
+            </div>
+          </MessageInfoBox>
           <div className={styles.assistants_grid}>
             {assistants.map((assistant) => {
               return (