pidgin/nest

Add a new post on the bintray shutdown and update previous posts that pointed to bintray

Testing Done:
Ran locally

Reviewed at https://reviews.imfreedom.org/r/478/
env:
browser: true
es6: true
node: true
extends: 'eslint:recommended'
globals:
Atomics: readonly
SharedArrayBuffer: readonly
parserOptions:
ecmaVersion: 2018
sourceType: module
rules: {}