feat: adiciona menu Desenvolvedor as configuracoes, nova modal Sobre e icones da marca TatuChat

- Submenu Desenvolvedor em Configuracoes (Sobre o servidor, Registros, Variaveis e ambiente)
- Modal Sobre maior com logo, descricao com link e rodape (codigo-fonte, licenca, fechar)
- Descricao legivel no tema dark
- Drawer com a logo do projeto e links de support/formulario atualizados
- flutter_launcher_icons: regenera icones Android (mipmap + adaptive), Web, iOS, macOS, Windows

snap/snapcraft.yaml

@@ -42,7 +42,7 @@ description: |
   FluffyChat is a non-profit project based on open standards and driven entirely by volunteers. Infrastructure is funded by donations, and participation is open to everyone.
 
   Join the community: https://matrix.to/#/#fluffy-space:matrix.org
-  Website: http://fluffychat.im
+  Website: https://tatuchat.weltonmoura.com.br/home/
   Microblog: https://troet.cafe/@krille
 
 grade: stable