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Fixes #
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### What?
This PR adjusts the `.gitignore` file in the plugin template to prevent
tracking of the nested `.next` folder.
### Why?
The existing rule excludes a top-level `.next` folder. However, in the
plugin template, next generates the folder in `/dev` instead.
### How?
Adjusting `.gitignore` to consider that `.next` may be nested in
different folders.
Notes:
- Initially I made it explicit, after judging the rest of the file I
realized not everyone likes explicit rules so I simplified. Both
`**/.next/` & `.next/` should be functionally equivalent though.