Amend breadcrumbs to link to the section indexes, i.e., home/section/

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
Fix headers staying under the menu when clicked-to-scroll.

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)
Add integration test for hairpin nat

Docker-DCO-1.1-Signed-off-by: Guillaume J. Charmes <guillaume@charmes.net> (github: creack)
Merge pull request #5231 from ostezer/fix-breadcrumbs

Amend breadcrumbs to link to the section indexes, i.e., home/:section/
Merge pull request #5233 from ostezer/docs-fix-scroll-header-margin

Fix headers staying under the menu when clicked-to-scroll.
this topic nolonger crashes the build

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #5245 from SvenDowideit/more-working-with

this topic nolonger crashes the build
Merge pull request #5243 from creack/hairpin_nat_test

Add integration test for hairpin nat