Confusing ambiguity of page titles, missing section names

**Your Godot version:**
4.0.

**Issue description:**
At the moment, the title at the top of the page content, and the HTML page title, show only the page name, not which section it is in. This means, for example, that there are two pages called Introduction. If you didn't have the left-hand navigation open, you wouldn't know at a glance which one you were reading.

**URL to the documentation page (if already existing):**
Compare https://docs.godotengine.org/en/stable/about/introduction.html :


and https://docs.godotengine.org/en/stable/getting_started/introduction/index.html :


Could the section title be included at the top (and similar in the HTML title), e.g. [Home icon] / About / Introduction, and [Home icon] / Getting Started / Introduction?