html: Remove "Impressum" (Legal notice) and create links for "Datenschutz" (upcoming)

Legal notice (Impressum) is not needed in private sites.

Signed-off-by: Alex Naidis <alexnai00@gmail.com>
html: add a privacy policy (datenschutz.html)

Signed-off-by: Alex Naidis <alexnai00@gmail.com>
html: removed encryption paragraph as there is no encryption

Signed-off-by: Alex Naidis <alexnai00@gmail.com>