build: install prettier, husky & lint-staged

Overview

In this PR, I have installed Prettier, Husky & Lint-staged to make sure to unify the code format before committing. Also, I've configured it so that you can now run Docusaurus server locally with yarn start directly from the root directory, without needing to navigate to the /docs folder.

Changes

Installed yarn in the root directory
Added Prettier, Husky & Lint-staged
Formatted every single file with Prettier
Integrated the /docs directory with Yarn Workspaces
Modified .gitignore
Modified README.md to describe how to run Docusaurus server locally

Notes

Since I've integrated the /docs directory with Yarn Workspaces, now, running yarn from the root directory installs dependencies for both the root and the /docs directories at once.

Thus, you no longer need to navigate to the /docs directory to run Docusaurus server locally as follows.

Previously

Navigate to the /docs directory
```
cd docs
```
Install the dependencies
```
yarn
```
Start the Docusaurus development server
```
yarn start
```

From now on

Install the dependencies in the root directory
```
yarn
```
Start the Docusaurus development server from the root directory
```
yarn start
```

Assignee Checklist:

[x] The base branch is correct (no accidental merges)

Reviewer Checklist

Code readability and simplicity
Follows best practices and coding standards
Understandable and maintainable code

Tascurator / tascurator-documents