Update support contacts for INSTALL and gpio.1

INSTALL

@@ -23,7 +23,11 @@ To un-install wiringPi:
 
   ./build uninstall
 
-Gordon Henderson
+For help and support see:
 
-projects@drogon.net
+* https://github.com/WiringPi/WiringPi/issues
+* https://discord.gg/SM4WUVG
+
+
+wiringPi originally created by Gordon Henderson
 https://projects.drogon.net/

gpio/gpio.1

@@ -337,7 +337,7 @@ Gordon Henderson
 
 .SH "REPORTING BUGS"
 
-Please report bugs to <projects@drogon.net>
+Please report bugs to https://github.com/WiringPi/WiringPi/issues
 
 .SH COPYRIGHT