feat: run web server first

Closes https://git.vvvvvvaria.org/decentral1se/distribusi-go/issues/8

.gitignore

@@ -1,3 +1,4 @@
 *.css
 dist/
+distribusi
 test

distribusi.go

@@ -216,12 +216,32 @@ Example:
 
 			logrus.Debugf("selecting %s as distribusi root", root)
 
+			ch := make(chan error, 2)
+			go func() {
 				if err := distribusify(c, root, ignore); err != nil {
-				logrus.Fatal(err)
+					ch <- err
+					return
 				}
 
+				ch <- nil
+				return
+			}()
+
 			if c.Bool("serve") {
+				go func() {
 					if err := serveHTTP(root); err != nil {
+						ch <- err
+						return
+					}
+
+					ch <- nil
+					return
+				}()
+			}
+
+			for i := 1; i <= 2; i++ {
+				err := <-ch
+				if err != nil {
 					logrus.Fatal(err)
 				}
 			}