created a Makefile to ease writing long commands to run.
refactor SeverFile with FileSever in cmd/site/main.go which returns a handler that serves HTTP requests with the contents of the file system rooted at root.
added Golang logo & completed navbar & hero section.
Makefileto ease writing long commands to run.SeverFilewithFileSeverincmd/site/main.gowhich returns a handler that serves HTTP requests with the contents of the file system rooted at root.