update readmes to use the new osbuild-composer package

CONTRIBUTING.md

@@ -17,7 +17,7 @@ $ cd osbuild-composer
 
 ```
 $ dnf group install 'RPM Development Tools'        # Install rpmbuild
-$ dnf builddep golang-github-osbuild-composer.spec # Install build-time dependencies
+$ dnf builddep osbuild-composer.spec               # Install build-time dependencies
 $ sudo dnf -y install cockpit-composer             # Optional: Install cockpit integration
 $ sudo systemctl start cockpit.socket              # Optional: Start cockpit
 ```

README.md

@@ -5,7 +5,7 @@ An HTTP service for building bootable OS images. It provides the same API as [lo
 You can control it in [Cockpit](https://github.com/weldr/cockpit-composer) or using the [composer-cli](https://weldr.io/lorax/composer-cli.html). To get started on Fedora, run:
 
 ```
-# dnf install cockpit-composer golang-github-osbuild-composer composer-cli
+# dnf install cockpit-composer osbuild-composer composer-cli
 # systemctl enable --now cockpit.socket
 # systemctl enable --now osbuild-composer.socket
 ```

test/README.md

@@ -55,9 +55,9 @@ The easiest way to get started with integration testing from a git
 checkout is:
 
 * `dnf -y install rpm-build`
-* `dnf -y builddep golang-github-osbuild-composer.spec`
+* `dnf -y builddep osbuild-composer.spec`
 * `make rpm` to build the software under test
-* `dnf install rpmbuild/RPMS/x86_64/golang-github-osbuild-composer-*.rpm` - this will
+* `dnf install rpmbuild/RPMS/x86_64/osbuild-composer-*.rpm` - this will
   install both osbuild-composer, its -debuginfo, -debugsource and -tests packages
 * `systemctl start osbuild-composer`
 * `/usr/libexec/tests/osbuild-composer/osbuild-tests` to execute the test suite.