docs: footer cleanup (#5457)

## Description

Switch maintainer information

Closes: #XXX

docs/.vuepress/config.js

@@ -105,7 +105,7 @@ module.exports = {
         }
       ],
       smallprint:
-          'The development of the Tendermint project is led primarily by Tendermint Inc., the for-profit entity which also maintains this website. Funding for this development comes primarily from the Interchain Foundation, a Swiss non-profit.',
+          'The development of Tendermint Core is led primarily by [Interchain GmbH](https://interchain.berlin/). Funding for this development comes primarily from the Interchain Foundation, a Swiss non-profit. The Tendermint trademark is owned by Tendermint Inc, the for-profit entity that also maintains this website.',
       links: [
         {
           title: 'Documentation',