Added a image alternate in 'python-vaiables.md' and enhanced the button of Google-Student-Ambassador

Author: steam-bell-92

docs/Google-Student-Ambassador/part-2-application-process/index.mdx

@@ -58,7 +58,7 @@ As a selected ambassador, you will:
     href="https://event.recodehive.com/gemini"
     target="_blank"
     rel="noopener"
-    className="inline-block bg-indigo-600 hover:bg-indigo-700 text-white font-semibold px-8 py-3 rounded-lg shadow-lg transition-colors"
+    className="inline-block bg-gradient-to-r from-green-300 to-blue-500 hover:from-green-400 hover:to-blue-600 text-black font-semibold px-8 py-3 rounded-lg shadow-lg transition-colors"
   >
     👉 Apply Now
   </a>

docs/Google-Student-Ambassador/part-3-eligibility/index.mdx

@@ -42,7 +42,7 @@ More FAQs and full program details will be shared in the next update. But don’
     href="https://t2m.io/GSA"
     target="_blank"
     rel="noopener"
-    className="inline-block bg-indigo-600 hover:bg-indigo-700 text-white font-semibold px-8 py-3 rounded-lg shadow-lg transition-colors"
+    className="inline-block bg-gradient-to-r from-green-300 to-blue-500 hover:from-green-400 hover:to-blue-600 text-black font-semibold px-8 py-3 rounded-lg shadow-lg transition-colors" 
   >
     👉 Apply Now
   </a>

docs/python/python-variables.md

@@ -91,7 +91,7 @@ def = 30        # 'def' is a keyword
 Python variables can hold different types of data:
 
 
-  <img src="./assets/data-type.png"/>
+  <img src="./assets/data-type.png" alt='data-type table'>
 
 ### 6. Type Checking with `type()`