[documentation] Update usage / help message to include supported archive schema.

sources/cmd/archiver/archiver.go

@@ -1257,3 +1257,7 @@ func gobUnmarshal (_data []byte, _object interface{}) (error) {
 //go:embed usage.txt
 var usageText string
 
+func init () {
+	usageText = strings.ReplaceAll (usageText, "@{SCHEMA}", CurrentSchemaVersion)
+}
+

sources/cmd/archiver/usage.txt

@@ -1,3 +1,4 @@
+
   ====  kawipiko -- blazingly fast static HTTP server  ====
 
   |  Documentation, issues and sources:
@@ -32,5 +33,8 @@
     --progress
     --debug
 
+  ** supported archive version:  @{SCHEMA}
+
   ** for details see:
-     https://github.com/volution/kawipiko#kawipiko-archiver
+     https://github.com/volution/kawipiko/blob/development/documentation/manual-archiver.rst
+

sources/cmd/server/server.go

@@ -2442,3 +2442,7 @@ var _reportUsageIoWrites = & StatMetric {
 //go:embed usage.txt
 var usageText string
 
+func init () {
+	usageText = strings.ReplaceAll (usageText, "@{SCHEMA}", CurrentSchemaVersion)
+}
+

sources/cmd/server/usage.txt

@@ -1,3 +1,4 @@
+
   ====  kawipiko -- blazingly fast static HTTP server  ====
 
   |  Documentation, issues and sources:
@@ -50,5 +51,8 @@
     --report ; --quiet ; --debug
     --dummy ; --dummy-empty ; --dummy-delay <duration>
 
+  ** supported archive version:  @{SCHEMA}
+
   ** for details see:
-     https://github.com/volution/kawipiko#kawipiko-server
+     https://github.com/volution/kawipiko/blob/development/documentation/manual-server.rst
+