html: avoid horizontal overflows, break-word and limit image width

html: avoid horizontal overflows, break-word and limit image width

break-work affects very long lines on all widths, as pre/monospaced
elements are limited in their available width. This is only a
rendering word break, i.e., if one copies the data they will get the
original "unbroken" one.

The "max-width=100%" enforces only better visuals where space is
limited anyway.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>