Release pakakeh.go v0.60.2 (2025-12-27)

This is periodic and last release of pakakeh.go for year 2025.
There is no changes on code level only on documentation.

In the _doc, we merge the index.adoc into README.md so we can served the
_doc directory under https://kilabit.info/project/pakakeh.go .
We also fix some broken links in documentation files.

In lib/time, add missing "Hourly" section in the package documentation.

The go.mod is updated to use Go 1.24.0 as minimum version; and all
dependencies has been updated to latest release.
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