rebrand to useSend (#210)

apps/docs/api-reference/introduction.mdx

@@ -5,12 +5,12 @@ description: "Fundamental concepts of Usend's API."
 
 ## Base URL
 
-Unsend's API is built on REST principles and is served over HTTPS. To ensure data privacy, unencrypted HTTP is not supported.
+useSend's API is built on REST principles and is served over HTTPS. To ensure data privacy, unencrypted HTTP is not supported.
 
 The Base URL for all API endpoints is:
 
 ```sh Terminal
-https://app.unsend.dev/api/
+https://app.usesend.com/api/
 ```
 
 ## Authentication
@@ -21,4 +21,4 @@ Authentication to Usend's API is performed via the Authorization header with a B
 Authorization: Bearer us_12345
 ```
 
-You can create a new token/API key under your Unsend [Developer Settings](https://app.unsend.dev/dev-settings/api-keys).
+You can create a new token/API key under your useSend [Developer Settings](https://app.usesend.com/dev-settings/api-keys).

apps/docs/api-reference/openapi.json

@@ -2,11 +2,11 @@
   "openapi": "3.0.0",
   "info": {
     "version": "1.0.0",
-    "title": "Unsend API"
+    "title": "useSend API"
   },
   "servers": [
     {
-      "url": "https://app.unsend.dev/api"
+      "url": "https://app.usesend.com/api"
     }
   ],
   "components": {
@@ -1479,4 +1479,4 @@
       }
     }
   }
-}
+}