add postcss with plugins and a devcontainer, optimize build and deploy

[kuryart]

PostCSS plugins:

• autoprefixer
• postcss-import
• cssnano
• purgecss

Add devcontainer

Optimize build and deploy proccess

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 2a3b31e6aad232562a93202c6055ed85d293bc24

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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