Update readme.md

readme.md

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 - A SVG badge that works well from static mediums (like GitHub README pages)
 - Abuse prevention via [Google reCAPTCHA](https://www.google.com/recaptcha/intro/)
 
-Check out the [Demo](https://slackin.now.sh/) or read more about the [motivations and history](http://rauchg.com/slackin) behind Slackin.
-
 ## Usage
 
-Set up [Now](https://zeit.co/now) on your device and run this command. [Now](https://zeit.co/now) will automatically ask you for the required information and then spin up a deployment instantly. That easy!
-
-```bash
-now rauchg/slackin
-```
-
-Other platforms:
-
-- [Heroku](https://heroku.com/deploy?template=https://github.com/rauchg/slackin/tree/master)
-- [Azure](https://azuredeploy.net/)
-- [OpenShift](https://github.com/rauchg/slackin/wiki/OpenShift)
-- [IBM Cloud](https://cloud.ibm.com/devops/setup/deploy?repository=https://github.com/rauchg/slackin)
-
-### Tips
-
-Your team id is what you use to access your login page on Slack (eg: https://**{this}**.slack.com).
-
-You can find or generate your API test token at [api.slack.com/web](https://api.slack.com/web) – note that the user you use to generate the token must be an admin. You need to create a dedicated `@slackin-inviter` user (or similar), mark that user an admin, and use a test token from that dedicated admin user.  Note that test tokens have actual permissions so you do not need to create an OAuth 2 app. Also check out the Slack docs on [generating a test token](https://get.slack.help/hc/en-us/articles/215770388-Creating-and-regenerating-API-tokens).
-
-**Important:** If you use Slackin in single-channel mode, you'll only be
-able to invite as many external accounts as paying members you have
-times 5. If you are not getting invite emails, this might be the reason.
-Workaround: sign up for a free org, and set up Slackin to point to it
-(all channels will be visible).
-
-Here is where to [generate a secret and
-sitekey](https://www.google.com/recaptcha/admin) for Google reCAPTCHA.
-
 ### Badges
 
 #### Realtime ([demo](https://cldup.com/IaiPnDEAA6.gif))