restoring social share

[thescientist13]

Related Issue

resolves #39

Summary of Changes

1. Restored social sharing using web-social-share
2. Swapped Google with Pinterest (since Google+ is no more)

So there seem to be some issues(1, 2 with Stencil that made progress on this a bit challenging, but with a little tweaking to a fork, I got things working by:

1. pointing the module field to dist/websocialshare/websocialshare.esm.js instead of dist/esm/index.js, which was just resolving to to an empty file
2. Unfortunately things break down a bit more when building for production, and it looks like some of the other _dist/ files need to be there? My guess is Rollup doesn't know how to bundle variables in a dynamic import?

   import(`./${n}.entry.js`).then((e=>(D.set(n,e),e[t])),B)

   This was solved by adding a Rollup plugin specifically for handling variables in dynamic imports.

Tried manually copying those files and now getting this? So... progress? 

TODOs

1. Fix for production build command
2. Get the share into its place on the left top of the page
3. Get upstream fix from Greenwood - dependencies that reference more than one directory level of traversal (../) in their ESM specifiers do not resolve correctly ProjectEvergreen/greenwood#820

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