changelog: add changes to changelog

changelog/2493.md

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+### Fixed
+assets/blocks: small home page block improvements fixes #2493
+assets/variables//button: rm twitter related styling and variable partial fix for #2363
+apps/captcha: rm inline css and add to own file update structure to be more a11y friendly
+apps/userdashboard/*: small styling fixes fixes #2392
+assets/variables: reduce lightening slightly on tertiary background colour fixes #2369
+templates/project_list_tile: ensure abbr date title is translatable and update styling and make it hoverable on a tile link fixes #2222
+assets/account: update styling for user agreements fixes #1922