refactor: improve docusaurus site creation and handling

- Change site.new to always create/overwrite a site
- Add early exit to site.play if no config exists
- Use explicit sitename from docusaurus.config
- Enable openai.play action processing
- Remove debug code and improve struct initialization

lib/core/playbook/playbook.v

@@ -8,7 +8,7 @@ import crypto.blake2b
 @[heap]
 pub struct PlayBook {
 pub mut:
-	actions    []&Action @[skip; str: skip]
+	actions    []&Action
 	priorities map[int][]int // first key is the priority, the list of int's is position in list self.actions
 	othertext  string        // in case there is text outside of the actions
 	result     string        // if any result

lib/core/playcmds/factory.v

@@ -50,7 +50,7 @@ pub fn run(args_ PlayArgs) ! {
 	bizmodel.play(mut plbook)!
 	doctree.play(mut plbook)!
 	docusaurus.play(mut plbook)!
-	// openai.play(mut plbook)!
+	openai.play(mut plbook)!
 
 	// slides.play(mut plbook)!
 	// base_install(play(mut plbook)!