Remove obsolete main.go file

This file is an artifact from a previous incarnation of the project. The package it refers to no longer exists, so it serves no purpose other than to confuse.

bcmi-labs/libraries-repository-engine@ed3fc6d

Author: per1234

fmt_fix_vet

@@ -1,11 +1,8 @@
 #!/bin/bash -x
 
 go fmt ./src/arduino.cc/repository/...
-go fmt main.go
 go fmt sync_libraries.go
 go fix ./src/arduino.cc/repository/...
-go fix main.go
 go fix sync_libraries.go
 go vet ./src/arduino.cc/repository/...
-go vet main.go
 go vet sync_libraries.go