docs: Update README.md

Remove free trial language from readme

README.md

@@ -16,12 +16,6 @@ Our recommenation is to fork or download the entire repository and open a specif
 
 While the code might run and build without mParticle credentials, the SDKs will not upload events to our servers and will generate errors. Please visit [our docs](https://docs.mparticle.com/guides/getting-started/create-an-input/#create-access-credentials) for more details on setting up an Input API key.
 
-> **Startups, try mParticle for free**
->
-> mParticle offers qualified startups up to one year of complimentary access to its enterprise-grade Customer Data Platform (CDP). There are no sales calls — approved startups get instant access.
->
-> [Get mParticle Free →](https://www.mparticle.com/lpg/startup-accelerator/?utm_source=github_sample_apps)
-
 ### Sample Apps Directory
 
 Below is a list of sample apps, with a brief description of their intended use case. Please navigate to an individual Sample App's README.md file for specific use cases and implementation details.