Added arm builds, improve database

- The program will now be cross-compiled and released for arm as well as x86
- What we previously called "cache" is not actually a cache, as it holds content that can't be always retrieved. Now we're stopping calling it a cache.
- Improved history merging
- Fixed the README to include the database as a volume, and to fix some errors

main.go

@@ -18,12 +18,12 @@ func main() {
 
 	if !isFirstRun {
 		cr := cron.New()
-		_, err = cr.AddFunc("@hourly", config.updateCache)
+		_, err = cr.AddFunc("@hourly", config.updateHistory)
 		if err != nil {
 			log.Fatal(err)
 		}
 		cr.Start()
-		config.updateCache()
+		config.updateHistory()
 	}
 
 	engine := html.New("./templates/"+config.Dashboard.Theme, ".html")