appview: pages: show render button only on markdown files

appview/pages/pages.go

···
 	Active           string
 	BreadCrumbs      [][]string
 	ShowRendered     bool
+	RenderToggle     bool
 	RenderedContents template.HTML
 	types.RepoBlobResponse
 }

appview/pages/templates/repo/blob.html

···
                 <span>{{ byteFmt .SizeHint }}</span>
                 <span class="select-none px-1 md:px-2 [&:before]:content-['·']"></span>
                 <a href="/{{ .RepoInfo.FullName }}/blob/{{ .Ref }}/raw/{{ .Path }}">view raw</a>
+                {{ if .RenderToggle }}
                 <span class="select-none px-1 md:px-2 [&:before]:content-['·']"></span>
                 <a 
                 href="/{{ .RepoInfo.FullName }}/blob/{{ .Ref }}/{{ .Path }}?code={{ .ShowRendered }}" 
                 hx-boost="true"
                 >view {{ if .ShowRendered }}code{{ else }}rendered{{ end }}</a>
+                {{ end }}
             </div>
         </div>
     </div>

appview/state/repo.go

···
 			breadcrumbs = append(breadcrumbs, []string{elem, fmt.Sprintf("%s/%s", breadcrumbs[idx][1], elem)})
 		}
 	}
+	
+	showRendered := false
+	renderToggle := false
 
-	var showRendered = false
 	if markup.GetFormat(result.Path) == markup.FormatMarkdown {
-		showRendered = true
-	}
-
-	if r.URL.Query().Get("code") == "true" {
-		showRendered = false
+		renderToggle = true
+		showRendered = r.URL.Query().Get("code") != "true"
 	}
-
+	
 	user := s.auth.GetUser(r)
 	s.pages.RepoBlob(w, pages.RepoBlobParams{
 		LoggedInUser:     user,
···
 		RepoBlobResponse: result,
 		BreadCrumbs:      breadcrumbs,
 		ShowRendered:     showRendered,
+		RenderToggle:     renderToggle,
 	})
 	return
 }