Fix local building issue

[TalAmuyal]

Some small changes to oni-plugin-git-'s package.json:

• Moved oni-api & oni-types from dependencies to peerDependencies, so it now only references to the root's node_modules rather than having its own copy.
• Added missing rimraf to devDependencies as it is needed (I think) for the build command.

[codecov]

Codecov Report

Merging #2488 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2488   +/-   ##
======================================
  Coverage    44.2%   44.2%           
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  Files         344     344           
  Lines       13886   13886           
  Branches     1829    1829           
======================================
  Hits         6138    6138           
  Misses       7508    7508           
  Partials      240     240

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[TalAmuyal]

As mentioned in #2493, I tested the strange error and it occurs when using peerDependencies.
I reverted that part since it is a nice-to-have and will likely face it later when I try pluginizing more parts.

@akin909, will you re-review?

[akinsho]

@TalAmuyal looks good thanks for tweaking that 👍, just checking this all still works? (I'm away atm so can't run it locally) changes look minor anyway though so should be fine

[TalAmuyal]

Yes, it still works.
The important thing is the rimraf dependency.