Make it more obvious how to add text

Is your feature request related to a problem? Please describe.

I've just started using Folium, and while it is very useful, I have been frustrated by the lack of documentation on how to add text elements - other than marker tooltips and popups, neither of which are initially visible to the user. As far as I can see there is nothing at all in the user guide or advanced guide.

A search for 'text' doesn't seem to point to anything relevant either, except PolyLineTextPath which is for a relatively specialist text case.

From StackOverflow etc. searches, the simplest solution for most cases seems to be to use a DivIcon for most cases. But that is very hidden in the documentation. I can see there are other methods via Leaflet or branca APIs.

Describe the solution you'd like

• Add a Text section to the user guide with recommended ways to add text elements.
• Add a bit of detail including the word 'text' to relevant API sections so they can be found more easily.

Describe alternatives you've considered
n/a

Additional context
n/a

Implementation
folium is maintained by volunteers. Can you help make a PR if we want to implement this feature?
Probably, depending on how complex it is to make docs changes.

まず、issue にリンクされているユーザーガイド、アドバンストガイド、DivIcon API リファレンスを読んで、関連するドキュメントのセクションを確認します。ユーザーガイドに、表示するテキストを追加する推奨方法を説明する「Text」セクションがあり、関連する API セクションにテキスト関連の例を検索できる文言が含まれていれば完了です。