added feature file

towncrier/newsfragments/1966.feature

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+AdminLTE3 design optimizations, asset compression and caching
+
+- fixed copy of qemu-arm-static for alpine
+- added 'set -eu' safeguard
+- silenced npm update notification
+- added color to webpack call
+- changed Admin-LTE default blue
+- AdminLTE 3 style tweaks
+- localized datatables
+- moved external javascript code to vendor.js
+- added mailu logo
+- moved all inline javascript to app.js
+- added iframe display of rspamd page
+- updated language-selector to display full language names and use post
+- added fieldset to group and en/disable input fields
+- added clipboard copy buttons
+- cleaned external javascript imports
+- pre-split first hostname for further use
+- cache dns_* properties of domain object (immutable during runtime)
+- fixed and splitted dns_dkim property of domain object (space missing)
+- added autoconfig and tlsa properties to domain object
+- suppressed extra vertical spacing in jinja2 templates
+- improved accessibility for screen reader
+- deleted unused/broken /user/forward route
+- updated gunicorn to 20.1.0 to get rid of buffering error at startup
+- switched webpack to production mode
+- added css and javascript minimization
+- added pre-compression of assets (gzip)
+- removed obsolete dependencies
+- switched from node-sass to dart-sass
+- changed startup cleaning message from error to info
+- move client config to "my account" section when logged in
+