Remove Tesla and update contributing guide (#2737)

CONTRIBUTING.md

@@ -4,7 +4,7 @@
 opened to market company APIs that offer paid solutions. This API list is not a marketing tool, but a tool to help the
 community build applications and use free, public APIs quickly and easily. Pull requests that are identified as marketing attempts will not be accepted.
 >
-> Please make sure the API you want to add has a full free access or at least a free tier before submitting.
+> Please make sure the API you want to add has full, free access or at least a free tier and does not depend on the purchase of a device/service before submitting.  An example that would be rejected is an API that is used to control a smart outlet - the API is free, but you must purchase the smart device.
 >
 > Thanks for understanding! :)
 

README.md

@@ -1504,7 +1504,6 @@ API | Description | Auth | HTTPS | CORS |
 | [Mercedes-Benz](https://developer.mercedes-benz.com/apis) | Telematics data, remotely access vehicle functions, car configurator, locate service dealers | `apiKey` | Yes | No |
 | [NHTSA](https://vpic.nhtsa.dot.gov/api/) | NHTSA Product Information Catalog and Vehicle Listing | No | Yes | Unknown |
 | [Smartcar](https://smartcar.com/docs/) | Lock and unlock vehicles and get data like odometer reading and location. Works on most new cars | `OAuth` | Yes | Yes |
-| [Tesla](https://www.teslaapi.io/) | API commands to communicate between your vehicle and your client | `OAuth` | Yes | Unknown |
 
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