docs: factor large docs into separate .md files to make them easier to maintain.

We then use the go embed command to embed them back into the binary.

cmd/mountlib/mount.go

@@ -3,6 +3,7 @@ package mountlib
 
 import (
 	"context"
+	_ "embed"
 	"fmt"
 	"log"
 	"os"
@@ -27,6 +28,9 @@ import (
 	"github.com/spf13/pflag"
 )
 
+//go:embed mount.md
+var mountHelp string
+
 // Options for creating the mount
 type Options struct {
 	DebugFUSE          bool
@@ -158,7 +162,7 @@ func NewMountCommand(commandName string, hidden bool, mount MountFn) *cobra.Comm
 		Use:    commandName + " remote:path /path/to/mountpoint",
 		Hidden: hidden,
 		Short:  `Mount the remote as file system on a mountpoint.`,
-		Long:   strings.ReplaceAll(strings.ReplaceAll(mountHelp, "|", "`"), "@", commandName) + vfs.Help,
+		Long:   strings.ReplaceAll(mountHelp, "@", commandName) + vfs.Help,
 		Annotations: map[string]string{
 			"versionIntroduced": "v1.33",
 			"groups":            "Filter",