Revert "Make GOMAXPROCS CPU limit aware"

I shouldn't have merged this without running the tests.

This libray logs to stderr on init, which is a no go for us.

Re. test failure:

```
[stderr]
2023/05/17 18:21:04 maxprocs: Leaving GOMAXPROCS=2: CPU quota undefined
```
This reverts commit 59050f9.

go.mod

@@ -60,7 +60,6 @@ require (
 	github.com/tdewolff/parse/v2 v2.6.5
 	github.com/yuin/goldmark v1.5.4
 	go.uber.org/atomic v1.10.0
-	go.uber.org/automaxprocs v1.5.2
 	gocloud.dev v0.24.0
 	golang.org/x/exp v0.0.0-20221031165847-c99f073a8326
 	golang.org/x/image v0.5.0

go.sum

@@ -574,8 +574,6 @@ go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/atomic v1.9.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/atomic v1.10.0 h1:9qC72Qh0+3MqyJbAn8YU5xVq1frD8bn3JtD2oXtafVQ=
 go.uber.org/atomic v1.10.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
-go.uber.org/automaxprocs v1.5.2 h1:2LxUOGiR3O6tw8ui5sZa2LAaHnsviZdVOUZw4fvbnME=
-go.uber.org/automaxprocs v1.5.2/go.mod h1:eRbA25aqJrxAbsLO0xy5jVwPt7FQnRgjW+efnwa1WM0=
 go.uber.org/goleak v1.1.10/go.mod h1:8a7PlsEVH3e/a/GLqe5IIrQx6GzcnRmZEufDUTk4A7A=
 go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
 go.uber.org/multierr v1.7.0/go.mod h1:7EAYxJLBy9rStEaz58O2t4Uvip6FSURkq8/ppBp95ak=

main.go

@@ -18,9 +18,6 @@ import (
 	"os"
 
 	"github.com/gohugoio/hugo/commands"
-
-	// default GOMAXPROCS to be CPU limit aware, still respecting GOMAXPROCS env
-	_ "go.uber.org/automaxprocs"
 )
 
 func main() {