Kudu deployment script and web.config for Azure
Get application configuration from env vars instead of yaml file
Run composer install prior to Kudu sync command

Previously it ran after sync. The vendor directory ended up under /site/repository rather than /site/wwwroot.
Only download composer if phar does not exist; don't sync unnecessary files to deployment target
Typo correction
intl extension does not need special handling; it is already available
Ignore composer.lock during deployment target sync; add robots.txt
Fixed a typo