Follow #23290
Network error won't make content lost. And this is a much better
approach than "loading-button".
The UI is not perfect and there are still some TODOs, they can be done
in following PRs, not a must in this PR's scope.
<details>
![image](
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db.go | ||
errpage.go | ||
errpage_test.go | ||
markup.go | ||
middleware.go | ||
middleware_test.go | ||
redirect.go | ||
serve.go |