Reorganize project structure and fix SQLite usage

internal/server/template.go

@@ -0,0 +1,31 @@
+package server
+
+import (
+	"embed"
+	"html/template"
+	"net/http"
+)
+
+//go:embed templates/*
+var templates embed.FS
+
+func (h *Server) loadTemplates() error {
+	var err error
+	h.tmpl, err = template.ParseFS(templates, "templates/*")
+	return err
+}
+
+func (s *Server) render(fetch fetcher, templateName string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("content-type", "text/html")
+		data, code, err := fetch(r)
+		if err != nil {
+			errorPage(err, code).ServeHTTP(w, r)
+			return
+		}
+		err = s.tmpl.ExecuteTemplate(w, templateName, data)
+		if err != nil {
+			errorPage(err, http.StatusInternalServerError).ServeHTTP(w, r)
+		}
+	}
+}