Rewrite project, add daily update of services list

The project was rewritten from Elixir to Go, primarily because:

- I don't write Elixir anymore and don't want to maintain a project in a
  language I no longer write
- I already write Go for other projects, including my day job, so it's
  a safer bet for a project that I want to maintain long term
- Go allows me to build portable executables that will make it easier
  for others to run farside on their own machines

The Go version of Farsside also has a built in task to fetch the latest
services{-full}.json file from the repo and ingest it, which makes
running a farside server a lot simpler.

It also automatically fetches the latest instance state from
https://farside.link unless configured as a primary farside node, which
will allow others to use farside without increasing traffic to all
instances that are queried by farside (just to the farside node itself).

main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/benbusby/farside/db"
+	"github.com/benbusby/farside/server"
+	"github.com/benbusby/farside/services"
+)
+
+func main() {
+	err := db.InitializeDB()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = services.InitializeServices()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	db.InitCronTasks()
+
+	signalChan := make(chan os.Signal, 1)
+	signal.Notify(signalChan, os.Interrupt, syscall.SIGTERM)
+
+	go func() {
+		<-signalChan
+		_ = db.CloseDB()
+		os.Exit(0)
+	}()
+
+	server.RunServer()
+}