Resolve "Renew the about us page"

Closes #1134

See merge request !1880

Merge branch '1134-renew-the-about-us-page' of https://gitlab.metager.de/open-source/MetaGer into 1134-renew-the-about-us-page

Remove unused variable.

See merge request !1884

Resolve "Duplicate Sentence in Transparency Page"

Closes #1135

See merge request !1879

Resolve "Include Yacy Search"

Closes #1136

See merge request !1881

Merge branch '1115-create-and-link-to-information-page-about-the-used-search-engines' into 'development'

Resolve "Create and link to information page about the used search engines"

Closes #1115

See merge request !1878

Merge branch 'development' into '1115-create-and-link-to-information-page-about-the-used-search-engines'

# Conflicts:
#   resources/less/metager/pages/all.less

Resolve "Remove Font-Awesome-Icons"

Closes #1116

See merge request !1844