[mirotalksfu] - add support us section

.env.template

@@ -288,6 +288,7 @@ SHOW_TRY_EASIER=true                              # Show "try easier" section (t
 SHOW_POWERED_BY=true                              # Show powered by (true|false)
 SHOW_SPONSORS=true                                # Show sponsors (true|false)
 SHOW_ADVERTISERS=true                             # Show advertisers (true|false)
+SHOW_SUPPORT_US=true                              # Show support us section (true|false)	
 SHOW_FOOTER=true                                  # Show footer (true|false)
 
 # Who Are You