Documentation of the `count` feature is incomplete

For a new-users the usage of the `count` feature is not easy to understand.

The first time it's mentioned in the documentation start with explaining how to sync the count with a server, here https://enaccess.github.io/OpenPAYGO-docs/docs/openpaygo-token/customization-of-openpaygo-token#counter-synchronisation-feature

and the follow section explains more use-cases of the Token https://enaccess.github.io/OpenPAYGO-docs/docs/openpaygo-token/customization-of-openpaygo-token?_highlight=count#entry-of-unused-older-tokens-unordered

But it's never really explained what the use-case is.

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A better way of structuring this part of the documentation would be

- Create a new section "Count feature" (probably a more descriptive name should be found)
- Add a new subsection that gives an introduction what the count is
- Group `Counter Synchronisation feature` and `Entry of Unused Older Tokens (Unordered)` as subsection