## Description
<!-- Please insert your description here and especially provide info
about the "what" this PR is solving -->
`vue-router` is producing a warning about duplicate route `/devtools` on
`stage-web`. Removing `stage-web/src/pages/devtools/index.vue` resolves
the warning.
There is a duplicate route introduced in
`stage-pages/src/pages/devtools/index.vue`. The file in `stage-web` is
removed in favor of the one in `stage-pages`.
related commit
[`44ec5e4`](https://github.com/moeru-ai/airi/commit/44ec5e416c04ab6fe1d39f01f67330703078439d)
## Linked Issues
<!-- Optional, if you have any -->
## Additional Context
<!-- e.g. is there anything you'd like reviewers to focus on? -->
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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Neko <neko@ayaka.moe>
DrHuangMHT