- 03-bundlers.mdx corrections:
    - `npm install parcel-bundler` must be called with `--save-dev`
    - `<script src="./src/index.ts">` must be closed with `</script>`
    - `npx` should be infront of `parcel index.html --no-autoinstall` for better compatibility
    - added proposed file structure for clearer understanding
    - changed file structure to the common one
- 02-conventions.mdx minor correction:
    - fixed typo