Remove a bunch of unused cruft

internal/handlers.go

@@ -4,8 +4,8 @@ import (
 	"encoding/json"
 	"fmt"
 	"html/template"
-	"io/ioutil"
 	"net/http"
+	"os"
 	"path/filepath"
 	"strings"
 	"time"
@@ -99,7 +99,7 @@ func (s *Server) CacheHandler() httprouter.Handle {
 
 		var entry Entry
 
-		data, err := ioutil.ReadFile(fn)
+		data, err := os.ReadFile(fn)
 		if err != nil {
 			log.WithError(err).Error("error reading cached entry")
 			http.Error(w, "Internal Server Error", http.StatusInternalServerError)