Move the in_dummy plugin article to input/

[Watson1978]

Summary

plugins/input/dummy.md was the last file left under plugins/. Every other article moved out of that directory long ago, but this one stayed behind and was never added to SUMMARY.md, so GitBook does not publish it — which is why v1.0/articles/in_dummy returns 404 today:

$ curl -sIL -o /dev/null -w '%{http_code}\n' https://docs.fluentd.org/v1.0/articles/in_dummy
404
$ curl -sIL -o /dev/null -w '%{http_code}\n' https://docs.fluentd.org/v1.0/articles/in_tail
200

in_dummy was renamed in_sample in v1.11.12, but the plugin is still shipped, so readers who land on the old URL should still get the article that explains the rename instead of a 404.

Changes

• Move the article to input/dummy.md, next to the other input plugin articles, and add it to SUMMARY.md right after sample.
• Point the v1.0/articles/in_dummy redirect at the new path.
• Fix its link to the sample article: /input/sample.md is a root-absolute path and does not resolve.
• Match the conventions of the surrounding articles — # dummy as the title, like input/sample.md and the rest, and the current one-line footer. This was the only file in the repository still carrying the old hard-wrapped footer with a horizontal rule.

It is intentionally left out of the plugin list in input/README.md, since dummy is a deprecated alias rather than a plugin to choose. monitor_agent is listed in SUMMARY.md but not there either.

Verification

honkit build produces input/dummy.html, it appears in the sidebar, and its link to sample resolves to sample.html. No reference to the old plugins/input/dummy.md path remains anywhere in the repository. codespell passes.

Note

This is a follow-up to #650, which fixes the rest of the broken internal links. The two do not overlap: #650 deliberately leaves this file untouched, and both edit .gitbook.yaml but in different places.

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