MAINT: remove unused file

docker/pylinkahead.ini

-# The INI file must be located either in
-# - $CWD/pylinkahead.ini
-# - $HOME/.pylinkahead.ini
-# - the location given in the env variable PYLINKAHEADINI
-
-[Connection]
-# url=https://demo.indiscale.com/
-url = http://localhost:80/provider/linkahead/
-
-## If this option is set, the SSL certificate will be ignored.  Use with care!
-#ssl_insecure=1
-
-username=admin
-
-## The password input method can be chosen with the `password_method` setting,
-## which by default is set to `plain`.
-##
-## DEFAULT: the password method is `plain`, now the password must be saved as
-## plain text.
-password_method=input
-# password=caosdb
-
-
-## OR: `input`: username is optional, password is entered by the user directly
-# password_method=input
-
-## OR: `pass`: password is retrieved from the "pass" password manager
-# password_method=pass
-# password_identifier=...
-
-## OR: `keyring`: using the system keyring/wallet (macOS, GNOME, KDE, Windows)
-## requires installation of the keyring python package:
-## pip install keyring
-# password_method=keyring
-
-timeout=10000