Informationsseite Leichte Sprache bereitstellen, resolve Tic #3132

app/controllers/siteinfo.php

app/views/siteinfo/edit.php

app/views/siteinfo/new.php

db/migrations/5.5.2_add_siteinfo_draft_field.php

db/migrations/5.5.3_create_page_easy_read.php

lib/classes/Siteinfo.php

lib/navigation/FooterNavigation.php

public/assets/images/icons/blue/contrast.svg

public/assets/images/icons/blue/easy-read.svg

public/assets/images/icons/blue/easy-read2.svg

resources/assets/stylesheets/scss/index.scss

templates/index_nobody.php