Summary:
- remove redundant `.gitmodule`. No more submodules.
- replace tabs with space as space is the majority here.
- spacing issues @ `.arcconfig`.
- sync `.arclint`.
- alphabetize configs.
Signed-off-by: Yongmin Hong <revi@omglol.email>
Test Plan: deploy and test?
Reviewers: O1 revi & automations, revi
Reviewed By: O1 revi & automations, revi
Differential Revision: https://issuetracker.revi.xyz/D171