Add missing documentation

[LeXXik]

Add missing documentation for the components:

• Body Component - done: Docs #15
• Char Component - done: Docs: add Char Component #17
• Constraint Component - done: Docs - Constraint Component System #24
• SoftBody Component - done: Docs #15
• Vehicle Component Vehicle Constraints - done: Vehicle constraints #66
• Shape Component - done: Docs #15
• Manager methods, e.g. raycasts, etc. - done: Jolt manager docs #68
• Initialization Settings - done: Jolt manager docs #68
• Landing README.md
• Create a separate repo for doc deployments

Vehicle Component was transformed into Vehicle Constraint. This is how it is implemented in Jolt and brings it in line with other constraints via Constraint Component.