fix(nuxt3-module): maintenance mode

[mdanilowicz]

Description

This pull request replaces createError function with showError to redirect the user to the Nuxt error page to display maintenance info.

More context about why we should use showError function can be found here nuxt/nuxt#15432

closes #1511

Type of change

ToDo's

Screenshots (if applicable)

Additional context

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@shopware/api-client

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@shopware/api-gen

npm i https://pkg.pr.new/shopware/frontends/@shopware/api-gen@1514

@shopware-pwa/composables-next

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@shopware-pwa/cms-base

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@shopware-pwa/helpers-next

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@shopware-pwa/nuxt3-module

npm i https://pkg.pr.new/shopware/frontends/@shopware-pwa/nuxt3-module@1514

commit: d6846af