Rename project to SSAU Generator and restructure content

- Move projects into content/<project>/{docx,pptx} with shared assets/
- Flatten config paths; output = project name in project folder
- Add pptx --init scaffold; remove docx exe build
- Add feature-complete content/example; ignore content/* except example
- Rewrite README and AGENTS.md

content/example/assets/images/flow.puml

@@ -0,0 +1,18 @@
+@startuml
+skinparam backgroundColor #FFFFFF
+skinparam defaultFontName "Times New Roman"
+skinparam shadowing false
+
+title Пример схемы PlantUML
+
+start
+:Исходный Markdown;
+:Разбор директив;
+if (Есть схема .puml?) then (да)
+  :Рендеринг через plantuml.jar;
+else (нет)
+  :Вставка готового PNG;
+endif
+:Сборка документа;
+stop
+@enduml