#1975 + #2076

[pkarw]

Related issues

(put links to related issues here)

Short description and why it's useful

@NataliaTepluhina please do add this to the docs:

Dynamic Categories prefetching (#2076)
Starting with Vue Storefront 1.7 we've added a configuration option config.entities.category.categoriesDynamicPrefetch (by default set to true). This option switches the way the category tree is being fetched. Previously we were fetching the full categories tree. In some cases it can generate even few MB of payload. Currently with this option in place we're pre-fetching the categories on demand while user is browsing the category tree

Screenshots of visual changes before/after (if there are any)

(if you made any changes in the UI layer please provide before/after screenshots)

Screenshot of passed e2e tests (if you are using our standard setup as a backend)

(run yarn test:e2e and paste the results. If you are not using our standard backend setup or demo.vuestorefront.io you can ommit this step)

Upgrade Notes and Changelog

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

Contribution and currently important rules acceptance

• I read and followed contribution rules
• I read the TypeScript Action Plan and adjusted my PR according to it
• I read about Vue Storefront Modules and I am aware that every new feature should be a module

[pkarw]

We should add to UPGRADE NOTES also an info that currently config.products.useMagentoUrlKeys is by default set to true and therefore the categories.url_key and product.url_key fields must be set in order to navigation to work @filrak could You add it to UPGRADE NOTES before releasing new version please?