[PC-1428] Nicla Vision Getting Started Guide Update (#1402)

* Images and sections updated

* Typo Fix

* Title Case Update

* Typos Fixed

* colors gif added

* Author and banner added

* Description update

* LED section moved

* Introduction title update

* Update content/hardware/06.nicla/boards/nicla-vision/tutorials/getting-started/content.md

Co-authored-by: Julián Caro Linares <jcarolinares@gmail.com>

* Update content/hardware/06.nicla/boards/nicla-vision/tutorials/getting-started/content.md

Co-authored-by: Julián Caro Linares <jcarolinares@gmail.com>

* Update content/hardware/06.nicla/boards/nicla-vision/tutorials/getting-started/content.md

Co-authored-by: Julián Caro Linares <jcarolinares@gmail.com>

* Intro sentence to LEDs

* Warning block added

* DFU explained

* Blink example better explained

* Typo fix

* Download section fix

* Format fix

* Apply suggestions from code review

Suggestions and feedback from Julián, Marta and Josefine

Co-authored-by: martab1994 <93210545+martab1994@users.noreply.github.com>

* New section header plus small improvements

* Linter issue solved

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Co-authored-by: Christopher Mendez <mcmchris@hotmail.com>
Co-authored-by: Christopher Méndez <49886387+mcmchris@users.noreply.github.com>
Co-authored-by: Julián Caro Linares <jcarolinares@gmail.com>
Co-authored-by: martab1994 <93210545+martab1994@users.noreply.github.com>

Author: 4 people