Enhance naming and bugs in docs

What's Changed

• Wrong call to super init in example by @wtaylor17 in #21
• Set device in fed_learn when needed based on what is available by @wtaylor17 in #23
• 22 problem with save dir vs save path by @fvarno in #24
• rebase dev by @fvarno in #25
• closes #26 by @fvarno in #27
• Change FLAlgrithm class name to CentralizedFLAlgorithm by @fvarno in #28

Full Changelog: v0.1.3...v0.1.4