Combine error templates.

controllers/error.go

@@ -1,7 +1,6 @@
 package controllers
 
 import (
-	"fmt"
 	"net/http"
 
 	"github.com/labstack/echo/v4"
@@ -26,8 +25,7 @@ func (e *Error) Get(err error, c echo.Context) {
 	p := NewPage(c)
 	p.Layout = "main"
 	p.Title = http.StatusText(code)
-	// TODO: fallback if there is no error template
-	p.Name = fmt.Sprintf("errors/%d", code)
+	p.Name = "error"
 	p.StatusCode = code
 
 	if err = e.RenderPage(c, p); err != nil {

controllers/page.go

@@ -41,6 +41,7 @@ type Page struct {
 		MaxAge  time.Duration
 		Tags    []string
 	}
+	RequestID string
 }
 
 func NewPage(c echo.Context) Page {
@@ -51,6 +52,7 @@ func NewPage(c echo.Context) Page {
 		StatusCode: http.StatusOK,
 		Pager:      pager.NewPager(c, DefaultItemsPerPage),
 		Headers:    make(map[string]string),
+		RequestID:  c.Response().Header().Get(echo.HeaderXRequestID),
 	}
 
 	p.IsHome = p.Path == "/"