pgAdmin 4 commit: Replace electron-forge with electron-builder as elect

Replace electron-forge with electron-builder as electron-forge uses old versions of electron. electron-builder allows
usto choose the electron version. 

Branch
------
electron2

Details
-------
https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=2c76d559d3a30b5107c4343b31ca28b4116ff843

Modified Files
--------------
electron/.gitignore        |     1 +
electron/package-lock.json | 14890 -------------------------------------------
electron/package.json      |   101 +-
electron/src/index.js      |     5 +-
electron/yarn.lock         |  9119 ++++----------------------
pkg/build-darwin.sh        |    66 -
pkg/build-linux.sh         |    94 -
pkg/build-windows.ps1      |    50 -
pkg/mac/build.sh           |     9 +-
9 files changed, 1294 insertions(+), 23041 deletions(-)