Resolve "Planet TYPO3"

Closes #439 and #401

See merge request services/typo3.org/typo3.org!275

# Conflicts:
#	composer.lock

Integrate typo3_roadmap extension

Closes #7, #10, #6, #13, #11, #14, #18, #19, #15, #21, #22, #23, #24, #25, #26, and #9

See merge request services/typo3.org/typo3.org!416

git-subtree-dir: extensions/typo3_roadmap
git-subtree-mainline: 36e6a529
git-subtree-split: d6b5bba5

Resolve "Update typo3_roadmap to 4.0.3"

Closes #578

See merge request services/typo3.org/typo3.org!415

Resolve "use lightbox for pictures"

Closes #9

See merge request services/typo3.org/typo3_roadmap!20

Merge branch '401-planet-typo3' of ssh://gitlab.typo3.org:2222/services/typo3.org/typo3.org into 401-planet-typo3

LDAP Usernames are stored a string

LDAP Usernames are unique, uids may change

Remove EXT:certifications

See merge request services/typo3.org/typo3.org!413

Update path to repositories after move

See merge request services/typo3.org/typo3.org!414