remove introduction dir + rename template-docs to sandbox-docs
(cherry picked from commit 3096b0d536c25fc0a26479ed46b84f2dc43e580f)

Conflicts:

	kie-docs/template-docs/pom.xml
docs: CompatibilityMatrix
(cherry picked from commit 196503056b5c423c743d8b24d0b4d81758157d5a)