Fix nuxt-theme deps and Boilerplate types

[filipsobol]

Short Description and Why It's Useful

Move vue-lazy-hydration dependency in nuxt-theme-module from devDependencies to dependencies and update types in Boilerplate to make eslint happy.

Which Environment This Relates To

• Test version (https://test.storefrontcloud.io) - this is a new feature or improvement for Vue Storefront. I've created branch from develop branch and want to merge it back to develop
• RC version (https://next.storefrontcloud.io) - this is a stabilisation fix for Release Candidate of Vue Storefront. I've created branch from release branch and want to merge it back to release
• Stable version (https://demo.storefrontcloud.io) - this is an important fix for current stable version. I've created branch from hotfix or master branch and want to merge it back to hotfix

Upgrade Notes and Changelog

• No upgrade steps required (100% backward compatibility and no breaking changes)
• I've updated the Upgrade notes and Changelog on how to port existing Vue Storefront sites with this new feature

[github-actions]

💙 vsf-next-demo successfully deployed at https://505ff18f71cf4d0ea7731597c1768c27506f0080.vsf-next-demo.preview.storefrontcloud.io