v0.5.3: New grid UI, full-text search, oneshot subcommand, Pocket API and Wallabag importers, bufixes, and packaging improvements

@cdvv7788

ArchiveResult moved to SQLite3 DB for performance @cdvv7788
lots of assorted bugfixes and improvements courtesy of @cdvv7788 and @jdcaballerov
new full-text search support with ripgrep and sonic courtesy of @jdcaballerov
new archivebox oneshot command for downloading a single site without starting a whole collection
new Pocket API importer courtesy of @mAAdhaTTah
new Wallabag importer courtesy of @ehainry
new extractor options on Add page courtesy of @BlipRanger
new apt/deb/homebrew/pip packaging setup into separate repos under new Github Org https://github.com/ArchiveBox
new official PPA and Docker Hub accounts https://hub.docker.com/r/archivebox/archivebox (with automatic armv7 builds courtesy of @chrismeller)
new Snapshot grid view courtesy of @jdcaballerov

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