refactor: load bkg png for public pages from assets

[emmenko]

Extracted from #2821

Simplifies the setup and avoids embedding the encoded png into the bundle.

[changeset-bot]

🦋 Changeset detected

Latest commit: 200bbd5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 35 packages

Name	Type
@commercetools-frontend/application-components	Patch
@commercetools-frontend/assets	Patch
@commercetools-frontend/application-shell	Patch
@commercetools-applications/merchant-center-template-starter-typescript	Patch
@commercetools-applications/merchant-center-template-starter	Patch
@commercetools-local/playground	Patch
@commercetools-local/visual-testing-app	Patch
@commercetools-website/components-playground	Patch
@commercetools-frontend/mc-scripts	Patch
@commercetools-frontend/cypress	Patch
@commercetools-backend/eslint-config-node	Patch
@commercetools-backend/express	Patch
@commercetools-backend/loggers	Patch
@commercetools-frontend/actions-global	Patch
@commercetools-frontend/application-config	Patch
@commercetools-frontend/application-shell-connectors	Patch
@commercetools-frontend/babel-preset-mc-app	Patch
@commercetools-frontend/browser-history	Patch
@commercetools-frontend/codemod	Patch
@commercetools-frontend/constants	Patch
@commercetools-frontend/create-mc-app	Patch
@commercetools-frontend/eslint-config-mc-app	Patch
@commercetools-frontend/i18n	Patch
@commercetools-frontend/jest-preset-mc-app	Patch
@commercetools-frontend/jest-stylelint-runner	Patch
@commercetools-frontend/l10n	Patch
@commercetools-frontend/mc-dev-authentication	Patch
@commercetools-frontend/mc-html-template	Patch
@commercetools-frontend/notifications	Patch
@commercetools-frontend/permissions	Patch
@commercetools-frontend/react-notifications	Patch
@commercetools-frontend/sdk	Patch
@commercetools-frontend/sentry	Patch
@commercetools-frontend/url-utils	Patch
@commercetools-website/custom-applications	Patch

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[tdeekens]

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[github-actions]

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[CarlosCortizasCT]

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