common/hugo: Add hugo.IsServer and hugo.IsDevelopment

And deprecate site.IsServer.

Closes #11510

resources/page/page_matcher_test.go

@@ -159,6 +159,7 @@ func TestDecodeCascadeConfig(t *testing.T) {
 
 type testConfig struct {
 	environment string
+	running     bool
 	workingDir  string
 }
 
@@ -166,6 +167,10 @@ func (c testConfig) Environment() string {
 	return c.environment
 }
 
+func (c testConfig) Running() bool {
+	return c.running
+}
+
 func (c testConfig) WorkingDir() string {
 	return c.workingDir
 }

resources/page/site.go

@@ -56,6 +56,7 @@ type Site interface {
 	Home() Page
 
 	// Returns true if we're running in a server.
+	// Deprecated: use hugo.IsServer instead
 	IsServer() bool
 
 	// Returns the server port.
@@ -211,6 +212,7 @@ func (s *siteWrapper) Home() Page {
 	return s.s.Home()
 }
 
+// Deprecated: use hugo.IsServer instead
 func (s *siteWrapper) IsServer() bool {
 	return s.s.IsServer()
 }
@@ -383,6 +385,7 @@ func (t testSite) GetIdentity() identity.Identity {
 	return identity.KeyValueIdentity{Key: "site", Value: t.l.Lang}
 }
 
+// Deprecated: use hugo.IsServer instead
 func (t testSite) IsServer() bool {
 	return false
 }