docs: update readme and contributing

CONTRIBUTING.md

@@ -1,9 +1,7 @@
 # Contributing
 
-First of all, thanks for being interested in contributing to Terra! If you have any questions about contributing, please contact us on [Discord](https://discord.gg/5fdPuxTg5Q).
+First of all, thanks for being interested in contributing to Terra! If you have any questions about contributing, please [join our chats](https://wiki.ultramarine-linux.org/en/community/community/).
 
-## Documentations
-
-* [Contribution Guide](https://developer.fyralabs.com/terra/contributing)
-* [FAQ](https://developer.fyralabs.com/terra/faq)
-* [Policy](https://developer.fyralabs.com/terra/policy)
+- [Contribution Guide](https://developer.fyralabs.com/terra/contributing)
+- [FAQ](https://developer.fyralabs.com/terra/faq)
+- [Policy](https://developer.fyralabs.com/terra/policy)

README.md

@@ -7,16 +7,31 @@
 Terra is a rolling-release Fedora repository for all the software you need.
 With Terra, you can install the latest packages knowing that quality and security are assured.
 
+See the introduction at [our website](https://terra.fyralabs.com).
+
 This monorepo contains the package manifests for all packages in Terra.
 
 ## Installation
+
 ```bash
 sudo dnf install --repofrompath 'terra,https://repos.fyralabs.com/terra$releasever' --setopt='terra.gpgkey=https://repos.fyralabs.com/terra$releasever/key.asc' terra-release
 ```
-You should also install the `terra-release` package so that when our infrastructure has any migrations, you can be assured that your Terra installation will still work as-is.
+
+If you are using immutable/atomic editions of Fedora, run the following commands instead:
+
+```bash
+curl -fsSL https://github.com/terrapkg/subatomic-repos/raw/main/terra.repo | pkexec tee /etc/yum.repos.d/terra.repo
+sudo rpm-ostree install terra-release
+```
 
 ## Documentation
-Our documentation can be found on our [Devdocs](https://developer.fyralabs.com/terra/). Alternatively, the GitHub Wiki contains older versions of the documentations.
+
+Our documentation can be found on our [Devdocs](https://developer.fyralabs.com/terra/).
 
 ## Questions?
-Feel free to reach out on [Discord](https://discord.gg/5fdPuxTg5Q). We're always happy to help!
+
+Feel free to reach out by [joining our community](https://wiki.ultramarine-linux.org/en/community/community/). We're always happy to help!
+
+- [Contribution Guide](https://developer.fyralabs.com/terra/contributing)
+- [FAQ](https://developer.fyralabs.com/terra/faq)
+- [Policy](https://developer.fyralabs.com/terra/policy)