Update base extensions documentation page

docs/extensions/extensions.md

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-# First party extensions & integrations
+# Extensions & Integrations
 
+## HydePHP - Extensible by design
 
-## Contribute
+HydePHP is designed to be extensible, and comes with a number of built-in extensions and integrations,
+as well as support for third-party extensions and integrations.
+
+## First party extensions & integrations
+
+### Realtime Compiler
+
+The Hyde Realtime Compiler is included with Hyde installations and is what powers the `php hyde serve` command.
+- Learn more about the [Realtime Compiler](realtime-compiler) in the documentation.
 
-Have an idea for an extension or integration? Let me know! I'd love to hear from you.
+## Integrations with third-party tools
+
+### Torchlight
+
+Torchlight is an amazing API for syntax highlighting, and is supported natively by HydePHP.
+- Learn more about [Torchlight](third-party-integrations#torchlight) in the documentation.
+
+## Contribute
 
-Get in touch on [GitHub](https://github.com/hydephp/hyde) or send me a DM on [Twitter](https://twitter.com/CodeWithCaen).
+Have an idea for an extension or integration? Let me know! I'd love to hear from you. Get in touch on
+[GitHub](https://github.com/hydephp/hyde) or send me a DM on [Twitter](https://twitter.com/CodeWithCaen).
+You may also want to look at the [Extension API](extensions-api) documentation to learn how to create extensions.