Update home page

hindki/src/content/docs/index.mdx

@@ -8,19 +8,16 @@ head:
 hero:
   tagline: A Hindi learning resource for English speakers, by <a href="/about-me">Ryan Pandya</a>.
   actions:
-    - text: Grammar Reference
-      link: /grammar
-      icon: open-book
+    - text: Flash Cards
+      link: /learn
+      icon: rocket
     - text: Vocabulary
       link: /vocabulary
       icon: right-arrow
-    - text: Hindi Textbook (260 MB)
-      link: https://files.pandu.ski/share/2BfsIfEb
-      icon: external
+    - text: Grammar Reference
+      link: /grammar
+      icon: open-book
       variant: minimal
-      attrs:
-        target: _blank
-        rel: noopener
 ---
 
 ## हिंदकी के बारे में / _About Hindki_