Remove remaining Grunt-era leftovers from docs/build/packaging

README.md and Framework.php's comment still told developers to install
grunt-cli for minified CSS; that's done via "npm run css" (build-css.mjs)
now, grunt itself isn't a dependency anywhere. doc/docker/development/Dockerfile
dropped the same now-pointless grunt-cli install. egroupware-epl.spec still
packaged updateGruntfile.php, which was removed earlier - would have broken
an RPM build.

Author: ralfbecker

README.md

@@ -20,11 +20,9 @@ EGroupware 26 can be installed via Docker, in fact the DEB/RPM packages also doe
 
 ### Deprecated EGroupware development installation:
 * install composer.phar from https://getcomposer.org/download/
-* for JavaScript dependencies and build install nodejs and npm
-* optional: for minified CSS install grunt
+* for JavaScript and CSS dependencies and build install nodejs and npm
 ```
-apt/yum/zypper install nodejs
-npm install -g grunt-cli
+apt/yum/zypper install nodejs npm
 ```
 * install EGroupware and dependencies
 ```

api/src/Framework.php

@@ -1046,7 +1046,7 @@ public function _get_css(array $themes_to_check = array())
 			{
 				if (file_exists(EGW_SERVER_ROOT.$theme_css)) break;
 			}
-			// no longer available in config, of you don't want minified CSS on a developer install, don't install grunt/generate the files
+			// no longer available in config, if you don't want minified CSS on a developer install, don't run "npm run css" to generate the files
 			//$debug_minify = !empty($GLOBALS['egw_info']['server']['debug_minify']) && $GLOBALS['egw_info']['server']['debug_minify'] === 'True';
 			if (/*!$debug_minify &&*/ file_exists(EGW_SERVER_ROOT.($theme_min_css = str_replace('.css', '.min.css', $theme_css))))
 			{

doc/docker/development/Dockerfile

@@ -57,7 +57,6 @@ RUN set -e \
 	&& ln -s /dev/stderr /var/log/php$PHP_VERSION-fpm.log \
 	# install tools to build EGroupware
 	&& apt-get install -y rsync zip curl sudo cron patch \
-	&& npm install -g grunt-cli \
 	&& bash -c \
 'EXPECTED_SIGNATURE=$(curl https://composer.github.io/installer.sig); \
 curl https://getcomposer.org/installer > composer-setup.php; \

doc/rpm-build/egroupware-epl.spec

@@ -617,7 +617,6 @@ ln -s ../../..%{egwdatadir}/header.inc.php
 %{egwdir}/README.md
 %{egwdir}/package.json
 %{egwdir}/Gruntfile.js
-%{egwdir}/updateGruntfile.php
 %{egwdir}/groupdav.htaccess
 %{egwdir}/webdav.php
 %{egwdir}/addressbook