upgrade greenwood v0.15.0

[thescientist13]

Related Issue

N / A

Summary of Changes

1. Upgrade latest version of Greenwood v0.15.0

Looks like something broke with `develop` with the importMap :/ 

Works fine with serve, though Rollup does emit this warning

% yarn build
yarn run v1.22.5
$ greenwood build
-------------------------------------------------------
Welcome to Greenwood (v0.15.0) ♻️
-------------------------------------------------------
Running Greenwood with the build command.
Initializing project config
Initializing project workspace contexts
Generating graph of workspace files...
pages to generate
 /Users/owenbuckley/Workspace/analogstudios.net/repo/www.analogstudios.net/src/index.html
success, done generating all pages!
The 'this' keyword is equivalent to 'undefined' at the top level of an ES module, and has been rewritten
The 'this' keyword is equivalent to 'undefined' at the top level of an ES module, and has been rewritten

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