Update personal writing style across this repo to a collective style

[iteles]

Although I am a fan of the person writing style, as @nelsonic points out in his review comments below, having a collective, we writing style is much more inviting to contributors.

Task

• [ ] Review pronouns from I to we for inclusivity

https://github.com/iteles/blw-baby/pull/32/files#r894981355

https://github.com/iteles/blw-baby/pull/32/files#r894981517