chore: remove timestamp from generated docs (#1265)

This is causing trouble with new PRs that potentially change CLI flags
or other user-facing UX. Another option besides completely removing the
version information is to modify Version.StringVerbose() so that it uses
the value of the most recent semver tag (or Knative tag).

```
❯ git describe --match "v*"
v0.34.0-6-g6d26e64c

❯ git describe --match "knative*"
knative-v1.7.0-6-g6d26e64c
```

This is nice, but could be misleading if the UX has changed since that
release.

Signed-off-by: Lance Ball <lball@redhat.com>

Signed-off-by: Lance Ball <lball@redhat.com>

cmd/root.go

@@ -34,7 +34,7 @@ func NewRootCmd(config RootCommandConfig) *cobra.Command {
 		Short:         "Serverless functions",
 		SilenceErrors: true, // we explicitly handle errors in Execute()
 		SilenceUsage:  true, // no usage dump on error
-		Long: `Serverless functions {{.Version}}
+		Long: `Knative serverless functions
 
 	Create, build and deploy Knative functions
 

docs/generator/main.go

@@ -17,14 +17,6 @@ import (
 )
 
 var (
-	// Statically-populated build metadata set by `make build`.
-	date, vers, hash string
-	version          = cmd.Version{
-		Date: date,
-		Vers: vers,
-		Hash: hash,
-	}
-
 	// Helper function for indenting template values correctly
 	fm = template.FuncMap{
 		"indent": func(i int, c string, v string) string {
@@ -41,7 +33,6 @@ var (
 type TemplateOptions struct {
 	Name    string
 	Options string
-	Version string
 	Use     string
 }
 
@@ -62,7 +53,6 @@ func main() {
 	templateOptions := TemplateOptions{
 		Name:    rootName,
 		Options: opts,
-		Version: version.StringVerbose(),
 		Use:     rootName,
 	}
 

docs/reference/func.md

@@ -4,7 +4,7 @@ Serverless functions
 
 ### Synopsis
 
-Serverless functions v0.0.0-source-2022-09-20T08:13:19+02:00
+Knative serverless functions
 
 	Create, build and deploy Knative functions