Add missing config keys

[idanizi-panw]

Is your feature request related to a problem? Please describe.
Missing config keys at https://glab-cli.io/docs/commands/config page (glab-docs/src/pages/docs/commands/config.mdx at the gitlab docs repo)

Describe the solution you'd like
Please add the following:

skip_tls_verify {true/false}
ca_cert {path to .pem file}

taken from:
profclems/glab#781 (comment)

Describe alternatives you've considered
None.

Additional context
None.