[#62] Refer to GitHub issue...

This update does the followings to implement better coding style guide
standard based on Airbnb Style Guide, ESLint, Prettier, and PEP8.

.editorconfig
- Added file to implement necessary format settings across different
IDEs including VSCode.

.eslintrc
- Removed Typescript related extensions and plugins as it prompts ESLint
unnecessary warnings. Will be implemented again once Typescript is used.
- Import plugin added to lint import-related codes.
- Several rules were included to overrule Prettier with Airbnb rules,
which we figured were better coding practices. The followings are
included: react/no-multi-comp semi, comma-dangle, no-underscore-dangle,
space-before-blocks, keyword-spacing, spaced-comment, quotes,
prefer-template, template-curly-spacing, jsx-quotes, camelcase,
no-unused-vars.
- Import rules were added to match with Airbnb style guide.
- Rules are subject to change in the future and documentation regarding
the changes will be written.

.prettierrc
- Some rules were changed to overrule Prettier with Airbnb rules.

.vscode/settings.json
- Editor indent setting was removed as it is now included in
.editorconfig.

package.json
- Removed Typescript related extensions and will be implemented in the
future once Typescript is used.
- Airbnb related ESLint plugins were added to enforce Airbnb style guide
rules.
- StyleLint was added to organize CSS files. The tool is being tested
and may be removed in the future.