chore: merge latest state of develop branch

src/.vuepress/components/Bar.vue

src/.vuepress/components/Cta.vue

src/.vuepress/components/Footer.vue

src/.vuepress/components/SearchPage.vue

src/.vuepress/components/SearchResultList.vue

src/.vuepress/enhanceApp.js

src/.vuepress/mixin/pathUrl.js

...epress/public/assets/images/SUB_left_horizontal_white.svg

...epress/public/assets/images/dfg_logo_schriftzug_weiss.svg

src/.vuepress/public/assets/images/logo-uni-goettingen.svg

src/.vuepress/theme/layouts/Edition.vue

src/.vuepress/theme/layouts/Home.vue

src/.vuepress/theme/layouts/Layout.vue

src/collation.md

src/de/impressum.md

src/de/index.md

src/de/literatur.md

src/de/motive.md

src/de/richtlinenedition.md

src/de/stemmata.md