Add slash command to send links, add normal commands for study guides & links

data/links.py

@@ -0,0 +1,16 @@
+import json
+from typing import Optional
+
+
+def load_all_links() -> dict[str, str]:
+    with open("files/links.json", "r") as file:
+        return json.load(file)
+
+
+def get_link_for(name: str) -> Optional[str]:
+    links = load_all_links()
+    for link in links:
+        if link.lower() == name.lower():
+            return links[link]
+
+    return None