Release gorankusu v0.8.0 (2025-02-03)

[BREAKING CHANGES]
The git submodule in "_www/wui" has been renamed to "_www/pakakeh_ts".
If you have cloned this project before, you need to rename the sub directory
manually and re-init it.
----
$ mv _www/wui _www/pakakeh_ts
$ git submodule update --init
----

[CHORE]
The linter has been replaced many times, from revive to "go vet", and from
using binary form of fieldalignment and shadow; to use internal command
gocheck that do the same things, which simplify our setup.

[CHORE]
Split the CSS into separate file.
This is allow modifying the CSS without touching the index.html, and may be
used by other HTML files later.

[CHORE]
Fix some broken links in the documentation pages, including link to
Changelog, README, and SPEC.
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