Proof of concept server side rendering in a gatsby example

Main Changes:

1. Stencil

   (stencil.config.ts)

    # 
    {
      type: 'dist-hydrate-script',
      dir: 'hydrate'
    },

   (package.json)

    "files": [
    "dist/",
    "loader/",
    "hydrate/"
    ],

2. Gatsby:

   const { defineCustomElements } = require("pocstencilssr/loader");
   defineCustomElements();

   import { Config } from '@stencil/core';
   
   export const config: Config = {
   namespace: 'pocstencilssr',
   outputTargets: [
   {
   type: 'dist',
   esmLoaderPath: '../loader',
   },
   {
   type: 'dist-custom-elements',
   },
   {
   type: 'docs-readme',
   },
   {
   type: 'www',
   serviceWorker: null, // disable service workers
   },
   {
   type: 'dist-hydrate-script',
   dir: 'hydrate'
   },
   ],
   testing: {
   browserHeadless: "new",
   },
   };