Enhance Makefile for Cilium website development and Docker workflow

[yashisrani]

fix: #773

Description:

• This PR improves the Makefile for the Cilium website by:

  • Adding an env target to safely copy .env.example to .env.
  • Introducing start (lightweight dev) and start-full (full dev) targets.
  • Adding Docker targets: docker-build, docker-run, docker-run-dev, and docker-shell.
  • Including linting, formatting, and reinstall targets for easier local setup.

• These changes simplify contributor setup, reduce CPU load during development, and standardize Docker workflows.

How to use:

make env           # create .env if missing
make start         # start lightweight dev server
make start-full    # start full dev server (images processed)
make build         # production build
make serve         # serve production build locally
make docker-build  # build Docker image
make docker-run    # run production Docker container
make docker-run-dev # run dev environment in Docker

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[paularah]

@yashisrani You should add a corresponding note in the README on how to use the makefile.

[paularah]

in the getting started section of README, add a note that says something along the lines of: "There's a makefile with all the dev commands, you can set the project using make dev, make env & make start.

[yashisrani]

@paularah Do you want me to also remove the raw npm commands (to avoid duplication), or should we keep both for flexibility?

[paularah]

Keep both. I'll add a small sidenote for the dev commands.

[paularah]

Thanks for the PR!