chore: remove temp Vite config files

[dib542]

This PR:

• removes the current mistakenly added Vite build config setup and then
• adds a gitignore rule to prevent any future additions

this file was accidentally added in https://github.com/duality-labs/duality-web-app/pull/544/files#diff-400fe2b3e5d963510378edd5c750a40de4dea065e410ea8b99e39fa58e04cc09

[dib542]

:tada: This PR is included in version 2.7.0 :tada:

The release is available on GitHub release

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