Summary:
Submitting three changes at once for lazyness:
meta: config cleanups
Add editorconfig, gitignore, and conform to them.
RobotsTxt: add differential rule and conform to the editorconfig
time.php: add metadata, editorconfig conformance
Signed-off-by: Yongmin Hong <revi@omglol.email>
Test Plan: `code .` and edit files. for php files, deploy.
Reviewers: #acl_sudoers, #blessed_reviewers, revi
Reviewed By: #acl_sudoers, #blessed_reviewers, revi
Differential Revision: https://issuetracker.revi.xyz/D8
