Fix to resolve `package.json`s from file, not `process`

[remcohaszing]

Initial checklist

• [x] I read the support docs
• [x] I read the contributing guide
• [x] I agree to follow the code of conduct
• [x] I searched issues and couldn’t find anything (or linked relevant results below)
• [x] If applicable, I’ve added docs and tests

Description of changes

The plugin might be run from an unexpected cwd, i.e. using remark-language-server in VS Code in Windows.

Due to variable scoping changes, there are a lot of indentation changes. I recommend reviewers to hide those.

Closes #39

[codecov-commenter]

Codecov Report

Merging #41 (ef2ae6d) into main (b512f0b) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main       #41   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          516       517    +1     
=========================================
+ Hits           516       517    +1     

Impacted Files	Coverage Δ
lib/get-repo-from-package.js	100.00% <100.00%> (ø)
lib/index.js	100.00% <100.00%> (ø)

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[wooorm]

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