drop Makefile, update README fixes #5478

Signed-off-by: Private Maker <privatemaker@posteo.net>

Makefile

@@ -1,70 +0,0 @@
-# This file is licensed under the Affero General Public License version 3 or
-# later. See the COPYING file.
-
-all: dev-setup lint build-js-production test test-php
-
-# Dev env management
-dev-setup: composer-install clean npm-init
-
-npm-init:
-	npm ci
-
-composer-init:
-	composer install --prefer-dist
-	composer update --prefer-dist
-
-composer-install:
-	composer install --prefer-dist
-
-npm-update:
-	npm update
-
-# Building
-build-js:
-	npm run dev
-
-build-js-production:
-	npm run build
-
-watch-js:
-	npm run watch
-
-# Testing
-test:
-	npm run test
-
-test-watch:
-	npm run test:watch
-
-test-coverage:
-	npm run test:coverage
-
-test-php:
-	phpunit -c phpunit.xml
-	phpunit -c phpunit.integration.xml
-
-test-php-coverage:
-	phpunit -c phpunit.xml --coverage-clover=coverage-unit.xml
-	phpunit -c phpunit.integration.xml --coverage-clover=coverage-integration.xml
-
-# Linting
-lint:
-	npm run lint
-
-lint-fix:
-	npm run lint:fix
-
-# Style linting
-stylelint:
-	npm run stylelint
-
-stylelint-fix:
-	npm run stylelint:fix
-
-# Cleaning
-clean:
-	rm -rf js
-
-# Builds the source package for the app store, ignores php and js tests
-appstore:
-	krankerl package

README.md

@@ -47,30 +47,28 @@ If you find bugs or have problems with the CalDAV-Backend, you should ask the te
 
 ## Build the app
 
-Make sure you have all the [necessary prerequisites](https://docs.nextcloud.com/server/latest/admin_manual/installation/source_installation.html#prerequisites-for-manual-installation) for manual installs
+General build instructions for the app itself are the same for all options.
 
-``` bash
-# set up and build for production
-make
+To build you will need to have [Node.js](https://nodejs.org/en/) and
+[Composer](https://getcomposer.org/) installed.
 
-# install dependencies
-make dev-setup
+- Install PHP dependencies: `composer install --no-dev`
+- Install JS dependencies: `npm ci`
+- Build JavaScript for the frontend
+    - Development build `npm run dev`
+    - Watch for changes `npm run watch`
+    - Production build `npm run build`
 
-# build for dev and watch changes
-make watch-js
+Read more about [necessary prerequisites](https://docs.nextcloud.com/server/latest/admin_manual/installation/source_installation.html#prerequisites-for-manual-installation) for manual installs
 
-# build for dev
-make build-js
 
-# build for production with minification
-make build-js-production
-
-```
 ## Running tests
-You can use the provided Makefile to run all tests by using:
+
+You can run the following back-end and front-end tests by using:
 
 ```
-make test
+composer test
+npm run test
 ```
 
 ## :v: Code of conduct