ARGG-816: Removed encodebase64 function

[xalechez]

After removing all the usages, we no longer need to keep this function and use it in Storybook. We also no longer require node-sass as a peerDependency

Remember to include the following changes:

• README.md (If you have created a new component)
• Component README.md
• Tests
• Storybook examples created/updated
• For breaking changes or deprecating components/properties, migration guides added to the description of the PR. If the guide has large changes, consider creating a new Markdown page inside the component's docs folder and link it here

[github-actions]

Visit https://backpack.github.io/storybook-prs/3056 to see this build running in a browser.

[olliecurtis]

We will also need to remove node-sass in the root package.json too just for a clean cut?

As I know backpack-node-sass will already bring its own version

[xalechez]

Added this to stop confusing registries locally 😆

[github-actions]

Visit https://backpack.github.io/storybook-prs/3056 to see this build running in a browser.

[github-actions]

Visit https://backpack.github.io/storybook-prs/3056 to see this build running in a browser.

[olliecurtis]

Closing as being brought as part of #3103