Add web front-end and fix API issues

node_modules/concurrently/docs/cli/configuration.md

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+# Configuration
+
+You might want to configure concurrently to always have certain flags on.
+Any of concurrently's flags can be set via environment variables that are prefixed with `CONCURRENTLY_`.
+
+```bash
+$ export CONCURRENTLY_KILL_OTHERS=true
+$ export CONCURRENTLY_HANDLE_INPUT=true
+# Equivalent to passing --kill-others and --handle-input
+$ concurrently nodemon "echo 'hey nodemon, you won't last long'"
+```