Update how-to-use-design-tracker.md delete FAQs (#734)

Number of previews vary by account - just deleting that part

content/analyst/inbox-and-design-tracker/how-to-use-design-tracker.md

@@ -50,11 +50,3 @@ You can use either method of testing to retest the same email. Design Tracker wi
 - Export email test results using the **Export Results** button on the _Email Preview Test Results_ screen.
 - Use the **Archive Test** button to hide tests from the _Email Previews Dashboard_. See archived tests by clicking the **Show** button next to **View Archived**, above the list of tests.
 - Manage which email client/device options are used for tests made by the static email address in **Configure** >> **Manage Default Test Clients**.
-
-## Frequently asked questions
-
-### Will this Beta feature go away? 
-No. Email previews are here to stay, and we are continuing to develop the tool. We have plans to add support for dark mode and link validation. 
-
-### How many tests can I run? 
-You can run up to 1,000 tests per month. One "test" is one email submission.