message: Update developer-guide.md
  .env is needed not only for Nextclade CLI but also for Nexxtclade web
diff: @@ -83,6 +83,9 @@ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
  # Add Rust tools to the $PATH
  export PATH="$PATH:$HOME/.cargo/bin"
  +# Prepare dotenv file with default values
  +cp .env.example .env
  +
  # Install wasm-pack
  cargo install wasm-pack
  