Merge pull request #515 from blockstack/GinaAbrams-patch-2

Update mining_intro.md

_develop/mining_intro.md

@@ -6,8 +6,16 @@ permalink: /:collection/:path.html
 # Understand App Mining
 {:.no_toc}
 
+**This is outdated documentation for the app mining program. App Mining Has Been Paused. 
+Thank you to the hundreds of you that participated and congratulations to our winners.**
+[More info](https://blog.blockstack.org/the-next-phase-of-app-mining/) & [all apps →](https://app.co/blockstack)
+
 This section explains App Mining, a program for developers. For Blockstack, App Mining is a crucial factor in the growth of both blockchain applications and users.  
 
+**This is outdated documentation for the app mining program. App Mining Has Been Paused. 
+Thank you to the hundreds of you that participated and congratulations to our winners.**
+[More info](https://blog.blockstack.org/the-next-phase-of-app-mining/) & [all apps →](https://app.co/blockstack)
+
 * TOC
 {:toc}