Add Cypress cache housekeeping instructions to README #3205
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This PR follows on from issue #3204 "Pruning Cypress cache to reclaim disk space".
It adds helpful information to the README file on how to reclaim storage space taken up by multiple cached Cypress versions.
Cypress automatically caches a copy of each version of Cypress at the time of installation. Updating to a later version of Cypress does not automatically clear out the Cypress cache, so over time it is possible that more and more storage space is taken up unnecessarily by cached Cypress versions.
The text added to the README file explains how to check for storage space used by Cypress cached versions and how to remove unneeded versions from the cache. Typically each cached Cypress version will need 0.5 GB of storage.
Internal Tracking ID: EXPOSUREAPP-14331