Serve pre-compressed static resources

Fix also some errors in the status template, and update to Bootstrap
4.3.1 and JQuery 3.4.0.

node/Makefile

+SOURCES = \
+	static/css/style.css \
+	static/css/bootstrap.min.css \
+	static/js/bootstrap.bundle.min.js \
+	static/js/jquery-3.4.0.slim.min.js \
+	static/js/autoradio.js
+
+COMPRESSED = \
+	$(SOURCES:%=%.br) \
+	$(SOURCES:%=%.gz)
+
+%.br: %
+	brotli --input $^ --output $@
+
+%.gz: %
+	zopfli $^
+
+all: $(COMPRESSED)
+
+clean:
+	-rm -f $(COMPRESSED)
+

node/http.go

 package node
 
+//go:generate make
 //go:generate go-bindata --nocompress --pkg node static/... templates/...
 
 import (
@@ -21,6 +22,7 @@ import (
 	"git.autistici.org/ale/autoradio"
 	pb "git.autistici.org/ale/autoradio/proto"
 	assetfs "github.com/elazarl/go-bindata-assetfs"
+	"github.com/lpar/gzipped"
 )
 
 var (
@@ -34,7 +36,7 @@ func newHTTPHandler(n *Node, icecastPort int, domain string) http.Handler {
 	tpl := mustParseEmbeddedTemplates()
 
 	// Serve /static/ from builtin assets.
-	mux.Handle("/static/", http.StripPrefix("/static/", http.FileServer(&assetfs.AssetFS{
+	mux.Handle("/static/", http.StripPrefix("/static/", gzipped.FileServer(&assetfs.AssetFS{
 		Asset:     Asset,
 		AssetDir:  AssetDir,
 		AssetInfo: AssetInfo,

node/static/style.css → node/static/css/style.css

@@ -13,7 +13,7 @@ body {
 }
 
 .page-header {
-  background: url(radio52.png) top left no-repeat;
+  background: url(../radio52.png) top left no-repeat;
   padding-left: 58px;
 }
 

node/static/js/autoradio.js

+$(function() {
+  $('[data-toggle="tooltip"]').tooltip();
+});