Merge branch 'issue/reader-3186506-reader-3186506-05-07-21' into 1.0.x

config/install/reader.settings.yml

config/schema/reader.schema.yml

src/Controller/ReaderController.php

src/Form/ReaderSettingsForm.php

src/Services/Reader.php

templates/reader-timeline.html.twig

themes/reader_theme/css/style.css

themes/reader_theme/js/reader.infinite.scroll.js

themes/reader_theme/reader_theme.libraries.yml

themes/reader_theme/scss/style.scss