docs: added branding to readme and required assets files

README.md

@@ -1,7 +1,9 @@
+![banner](docs/assets/images/banner_mwmbl.svg)
+
 Mwmbl: No ads, no tracking, no cruft, no profit
 ===============================================
 
-[![Matrix](https://img.shields.io/matrix/mwmbl:matrix.org?color=blue&label=Matrix)](https://matrix.to/#/#mwmbl:matrix.org)
+[![Matrix](https://img.shields.io/matrix/mwmbl:matrix.org?color=blue&label=Matrix&style=for-the-badge)](https://matrix.to/#/#mwmbl:matrix.org)
 
 Mwmbl is a non-profit, ad-free, free-libre and free-lunch search
 engine with a focus on useability and speed. At the moment it is