store downloaded archives in DASHT_CACHE_DIR instead of using DASHT_DOCSETS_DIR #61
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This improves interoperability with dash-docs.el (see https://github.com/dash-docs-el/dash-docs) which otherwise tries to open all archives stored in the DOCSETS directory when creating a list of installed docsets (which is a time consuming process and results in a timeout in dash-docs).
Since this is mostly a workaround for an issue with dash-docs.el, feel free to just close the PR without merging it. But if you're interested in a merge, I could try to provide some sort of (automatic?) migration script for existing installations.