Update README.md (metabase#23235)

- Removed non-content words to make sentence more concise.
- Removed hedging between "your applications" and "or third party software" to increase confidence by reducing indirection; third-party applications is already mentioned in the details as well and redundant.
- Emphasized "Hit" verb by starting the sentence with it.
- Swapped "specialized" for "custom" to remove ambiguity and emphasize the user/developer's role in setting up the software.

README.md

@@ -42,11 +42,11 @@ We want Metabase to be available in as many languages as possible. See which tra
 
 ## Extending Metabase
 
-Metabase also allows you to hit our Query API directly from Javascript to integrate the simple analytics we provide with your own application or third party services to do things like:
+Hit our Query API from Javascript to integrate analytics. Metabase enables your application to:
 
 - Build moderation interfaces.
 - Export subsets of your users to third party marketing automation software.
-- Provide a specialized customer lookup application for the people in your company.
+- Provide a custom customer lookup application for the people in your company.
 
 Check out our guide, [Working with the Metabase API](https://www.metabase.com/learn/administration/metabase-api).