Docker Nginx and PHP updates

[ssnukala]

1. Updated Nginx to use Pagespeed image
2. Updated PHP configuration to use php 7.4-fpm and made related changes to the extension options
3. Added XDebug configuration options for PHP

[codecov]

Codecov Report

Merging #1085 (83c7b94) into hotfix (c92bf0b) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             hotfix    #1085   +/-   ##
=========================================
  Coverage     67.76%   67.76%           
  Complexity     1997     1997           
=========================================
  Files           169      169           
  Lines          6995     6995           
=========================================
  Hits           4740     4740           
  Misses         2255     2255           

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[Silic0nS0ldier]

I've made some updates.

1. Bumped NodeJS from 12.x to 14.x
2. Updated Composer from v1 to v2 (be removing the downgrade code)
3. Removed ngx_pagespeed citing it being a production tool and poorly supported and maintained.

Overall, this brings Docker local development up to date with our other development approaches (no idea what NodeJS version Homestead uses though...).