Resolve "Roadmap - TYPO3 V11 compatibility"

Closes #592

See merge request !428

thx to Benni Mack

Add EXT:workspaces

See merge request !427

Add facets

See merge request !422

Update solr docker image for ddev

See merge request !421

Change inconsistent methods, adapt it to templates and remove whitespace between commas

See merge request !412

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