Fix grammatical and typo corrections for multiple files

[mdqst]

Description

Added typo corrections to documentation for the following files:

README.md

"Run one of the app" corrected to "Run one of the apps".

The word "apps" should be plural here, as it implies running one out of multiple applications.

CODE_OF_CONDUCT.md

"pledge to making participation" corrected to "pledge to make participation".

The correct form after "pledge to" is the infinitive "make," not "making."

CONTRIBUTING.md

"to deployed to ... production!" corrected to "to deploy to ... production!"

The verb form should be "deploy" rather than "deployed" in this context.

Goal

Correct grammatical errors and improve readability of the documentation.

Checklist:

• [x] 1 PR, 1 purpose: my Pull Request applies to a single purpose
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have updated the docs to reflect my changes if applicable
• [ ] I have added tests (and stories for frontend components) that prove my fix is effective or that my feature works
• [x] I have performed a self-review of my own code
• [ ] If my code involves visual changes, I am adding applicable screenshots to this thread

[cla-bot[bot]]

Thank you for your pull request and welcome to Unlock! We require contributors to sign our Contributor License Agreement, and we don't seem to have the users @mdqst on file. In order for us to review and merge your code, please open another pull request with a single modification: your github username added to the file .clabot. Thank you!