docs: update README

Author: mrholek

README.md

@@ -192,41 +192,7 @@ CoreUI is designed as the extension of [Bootstrap](https://getbootstrap.com). Sp
 
 ## Support CoreUI Development
 
-CoreUI is an MIT-licensed open source project and is completely free to use. However, the amount of effort needed to maintain and develop new features for the project is not sustainable without proper financial backing. You can support development by buying the [CoreUI PRO](https://coreui.io/pricing/) or by becoming a sponsor via [Open Collective](https://opencollective.com/coreui/).
-
-<!--- StartOpenCollectiveBackers -->
-
-### Platinum Sponsors
-
-Support this project by [becoming a Platinum Sponsor](https://opencollective.com/coreui/contribute/platinum-sponsor-40959/). A large company logo will be added here with a link to your website.
-
-<a href="https://opencollective.com/coreui/contribute/platinum-sponsor-40959/checkout"><img src="https://opencollective.com/coreui/tiers/platinum-sponsor/0/avatar.svg?avatarHeight=100"></a>
-
-### Gold Sponsors
-
-Support this project by [becoming a Gold Sponsor](https://opencollective.com/coreui/contribute/gold-sponsor-40960/). A big company logo will be added here with a link to your website.
-
-<a href="https://opencollective.com/coreui/contribute/gold-sponsor-40960/checkout"><img src="https://opencollective.com/coreui/tiers/gold-sponsor/0/avatar.svg?avatarHeight=100"></a>
-
-### Silver Sponsors
-
-Support this project by [becoming a Silver Sponsor](https://opencollective.com/coreui/contribute/silver-sponsor-40967/). A medium company logo will be added here with a link to your website.
-
-<a href="https://opencollective.com/coreui/contribute/silver-sponsor-40967/checkout"><img src="https://opencollective.com/coreui/tiers/gold-sponsor/0/avatar.svg?avatarHeight=100"></a>
-
-### Bronze Sponsors
-
-Support this project by [becoming a Bronze Sponsor](https://opencollective.com/coreui/contribute/bronze-sponsor-40966/). The company avatar will show up here with a link to your OpenCollective Profile.
-
-<a href="https://opencollective.com/coreui/contribute/bronze-sponsor-40966/checkout"><img src="https://opencollective.com/coreui/tiers/bronze-sponsor/0/avatar.svg?avatarHeight=100"></a>
-
-### Backers
-
-Thanks to all the backers and sponsors! Support this project by [becoming a backer](https://opencollective.com/coreui/contribute/backer-40965/).
-
-<a href="https://opencollective.com/coreui/contribute/backer-40965/checkout" target="_blank" rel="noopener"><img src="https://opencollective.com/coreui/backers.svg?width=890"></a>
-
-<!--- EndOpenCollectiveBackers -->
+CoreUI is an MIT-licensed open source project and is completely free to use. However, the amount of effort needed to maintain and develop new features for the project is not sustainable without proper financial backing. You can support development by buying the [CoreUI PRO](https://coreui.io/pricing/?framework=bootstrap&src=github-coreui) or by becoming a sponsor via [Open Collective](https://opencollective.com/coreui/).
 
 ## Copyright and license