docs: update import package name

Author: fahreddinozcan

packages/py/sdk/README.md

@@ -18,7 +18,7 @@ uv add context7
 
 ```python
 import asyncio
-from context7 import Context7
+from context7-sdk import Context7
 
 async def main():
     async with Context7(api_key="ctx7sk_...") as client:

packages/py/sdk/src/context7/__init__.py

@@ -7,7 +7,7 @@
 Example:
     ```python
     import asyncio
-    from context7 import Context7
+    from context7-sdk import Context7
 
     async def main():
         async with Context7(api_key="ctx7sk_...") as client: