refactor: config renaming for file-service

[hopeyen]

Issue link (if applicable)

Resolves #55

Checklist

• Are tests up-to-date with the new changes?
• Are docs up-to-date with the new changes? (Open PR on docs repo if necessary)

[github-actions]

Pull Request Test Coverage Report for Build 8194581787

Details

• 0 of 5 (0.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
file-service/src/file_server/mod.rs	0	1	0.0%
file-service/src/config.rs	0	2	0.0%
file-service/src/file_server/cost.rs	0	2	0.0%

Totals
Change from base Build 8194567053:	0.0%
Covered Lines:	0
Relevant Lines:	3586

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💛 - Coveralls