Improve config.js handling in .gitignore
Improve config.js handling in .gitignore

no issue
- all `config.js` files were ignored in git, this was causing issues in editors (well, Atom at least) where application files called `config.js` were being excluded from file lists and search/fuzzy finder. This change updates .gitignore to only ignore the root `config.js` file which is now the only file that is customised per-install

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