cmd/golangorg: fix -a mode (and README.md) for _content move

Change-Id: I78526b4834774ed46c59609467c2b43950f0cc99
Reviewed-on: https://go-review.googlesource.com/c/website/+/292589
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

README.md

@@ -4,7 +4,7 @@
 
 This repo holds content and serving programs for the golang.org web site.
 
-Content is in content/. Server code is in cmd/ and internal/.
+Content is in _content/. Server code is in cmd/ and internal/.
 
 To run the server to preview local content changes, use:
 
@@ -12,7 +12,7 @@ To run the server to preview local content changes, use:
 
 The supporting programs cmd/admingolangorg and cmd/googlegolangorg
 are the servers for admin.golang.org and google.golang.org.
-(They do not use the content/ directory.)
+(They do not use the _content/ directory.)
 
 Each command directory has its own README.md explaining deployment.
 

cmd/golangorg/main.go

@@ -124,7 +124,7 @@ func main() {
 			fmt.Fprintln(os.Stderr, "runtime.Caller failed: cannot find templates for -a mode.")
 			os.Exit(2)
 		}
-		dir := filepath.Join(file, "../../../content")
+		dir := filepath.Join(file, "../../../_content")
 		if _, err := os.Stat(filepath.Join(dir, "godoc.html")); err != nil {
 			fmt.Fprintln(os.Stderr, err)
 			fmt.Fprintln(os.Stderr, "Cannot find templates for -a mode.")