Add announcement

https://mrkvon.org/blog/announcing-solidcouch

additionally:
- cleaner logo
- small update of content
- TODO content (commented out)

README.md

@@ -1,5 +1,16 @@
 # Solid Couch
 
+**_--- Please [read the announcement](https://mrkvon.org/blog/announcing-solidcouch)! ---_**
+
 Decentralized hospitality exchange built with [Solid Protocol](https://solidproject.org). Soon, you can also start a community!
 
-It's a work in progress. Check out our [github](https://github.com/solidcouch).
+It's a work in progress. Check out [SolidCouch repositories](https://github.com/solidcouch).
+
+<!--## Communities
+
+- [Tired Bike](https://tired.bike) - Cyclists and other slow travellers
+- [Sleepy Bike](https://sleepy.bike) - Cyclists
+
+Do you have an idea for a new community? [Let us know]([email protected])!
+
+## Support-->