use shebang and shell syntax compatible with Ubuntu 22.04

[mmakowski]

Make it possible to run reslang on Ubuntu 22.04 (my work laptop OS).

Without these, ./install-reslang produces:

./install-reslang: 12: Syntax error: Bad fd number

And reslang produces:

/usr/bin/env: ‘npx ts-node’: No such file or directory
/usr/bin/env: use -[v]S to pass options in shebang lines

[ops-github-DU4JOAWE]

This change is