Refactor: cleanup

- Introduce tracing
- Introduce cobra / viper framework
- Introduce resty client
- Seperate files in api/ and bot/
- Trim unused functions

bot/handleSlashGreet.go

@@ -0,0 +1,28 @@
+package bot
+
+import (
+	"fmt"
+
+	"github.com/bwmarrin/discordgo"
+)
+
+func (b *Bot) handleSlashGreet(
+	s *discordgo.Session,
+	i *discordgo.InteractionCreate,
+) {
+	var username string
+	if i.Member != nil {
+		username = i.Member.User.Username
+	} else if i.User != nil {
+		username = i.User.Username
+	} else {
+		username = "Unknown"
+	}
+
+	s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
+		Type: discordgo.InteractionResponseChannelMessageWithSource,
+		Data: &discordgo.InteractionResponseData{
+			Content: fmt.Sprintf("Ciallo, %s!", username),
+		},
+	})
+}