Remove .eslintignore

[pavithraes]

Use of .eslintignore is deprecated, and raises the following warning:

 ESLintIgnoreWarning: The ".eslintignore" file is no longer supported. Switch to using the "ignores" property in "eslint.config.js": https://eslint.org/docs/latest/use/configure/migration-guide#ignoring-files

We already use the ignores property (thanks to Kim!):

nebari-docs/docs/eslint.config.mjs

Line 20 in 51d2bd6

ignores: [

So this PR deletes the .eslintignore file that's no longer required.

What does this implement/fix?

Put a x in the boxes that apply

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features not to work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe):

Testing

• Did you test the pull request locally?
• Did you add new tests?

Documentation

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