[Do not Merge] Adding release notes for 0.3 and 0.4 (#1370)

* Adding release notes for 0.3 and 0.4

website/content/docs/releases/release-notes/v0_1_0.mdx

@@ -5,7 +5,7 @@ description: |-
   Boundary release notes for v0.1.0
 ---
 
-# Boundary v0.1.0
+# [Boundary v0.1.0](https://www.boundaryproject.io/downloads)
 
 v0.1.0 is the first release of Boundary. As a result there are no changes, improvements, or bugfixes from past versions. To learn about what Boundary consists of, we highly recommend you start at the [Getting Started Page](/docs/getting-started).
 

website/content/docs/releases/release-notes/v0_2_0.mdx

@@ -5,7 +5,7 @@ description: |-
   Boundary release notes for v0.2.0
 ---
 
-# Boundary v0.2.0
+# [Boundary v0.2.0](https://www.boundaryproject.io/downloads)
 
 The release notes below contain information about Boundary v0.2.0 as well as new features since Boundary's 0.1.0 that became available in 0.1.x releases. To see a granular record of when each item was merged into the Boundary project, please refer to the [Changelog](https://github.com/hashicorp/boundary/blob/main/CHANGELOG.md). To learn about what Boundary consists of, we highly recommend you start at the [Getting Started Page](/docs/getting-started).
 

website/content/docs/releases/release-notes/v0_3_0.mdx

@@ -0,0 +1,24 @@
+---
+layout: docs
+page_title: v0.3.0
+description: |-
+  Boundary release notes for v0.3.0
+---
+
+# [Boundary v0.3.0](https://www.boundaryproject.io/downloads)
+
+The release notes below contain information about Boundary v0.3.0, Boundary Desktop v1.1.0, as well as new features since Boundary's 0.2.0 that became available in 0.2.x releases. To see a granular record of when each item was merged into the Boundary project, please refer to the [Changelog](https://github.com/hashicorp/boundary/blob/main/CHANGELOG.md). To learn about what Boundary consists of, we highly recommend you start at the [Getting Started Page](/docs/getting-started).
+
+Lastly, for instructions on how to upgrade an existing Boundary deployment to v0.3.0, please review Boundary’s [general upgrade guide](https://learn.hashicorp.com/tutorials/boundary/upgrade-version).
+
+## Boundary v0.3.0 Highlights
+
+**Boundary Desktop for Windows:** [Boundary Desktop v1.1.0](https://releases.hashicorp.com/boundary-desktop/) gives users the ability to connect to remote targets and view active session details. Boundary Desktop is now available for both Windows and MacOS.
+
+**Managed groups:** Managed groups allow the population of Boundary groups based on external IdP metadata. This feature allows users of our OIDC authentication method to automatically create groups based on the IdP they’re integrating with over OIDC.
+
+**OIDC configuration improvements:** Administrators can now configure Boundary authentication from OIDC identity providers in the Boundary admin console and Boundary's Terraform Provider.
+
+## What's Changed
+
+For detailed information of all changes since 0.2.0, please refer to the [Changelog](https://github.com/hashicorp/boundary/blob/main/CHANGELOG.md)

website/content/docs/releases/release-notes/v0_4_0.mdx

@@ -0,0 +1,26 @@
+---
+layout: docs
+page_title: v0.4.0
+description: |-
+  Boundary release notes for v0.4.0
+---
+
+# [Boundary v0.4.0](https://www.boundaryproject.io/downloads)
+
+The release notes below contain information about new functionality available in Boundary v0.4.0. To see a granular record of when each item was merged into the Boundary project, please refer to the [Changelog](https://github.com/hashicorp/boundary/blob/main/CHANGELOG.md). To learn about what Boundary consists of, we highly recommend you start at the [Getting Started Page](/docs/getting-started).
+
+Lastly, for instructions on how to upgrade an existing Boundary deployment to v0.4.0, please review Boundary’s [general upgrade guide](https://learn.hashicorp.com/tutorials/boundary/upgrade-version).
+
+## Boundary v0.4.0 Highlights
+
+**Session Credential Brokering:** Boundary 0.4, adds a Vault integration for the brokering of [Vault](https://www.vaultproject.io/) secrets to Boundary clients (both command line and desktop clients) for use
+in Boundary sessions. Brokering of Vault secrets is the foundation of Boundary’s larger credential-management story for seamless single sign-on to infrastructure targets. This feature introduces new Boundary resources - [credential stores](https://www.boundaryproject.io/docs/concepts/domain-model/credential-stores), [credential libraries](https://www.boundaryproject.io/docs/concepts/domain-model/credential-libraries), and [credentials](https://www.boundaryproject.io/docs/concepts/domain-model/credentials) -
+to support binding credentials with user sessions, as well as surfacing those credentials during session initialization on the command line and in Boundary Desktop.
+
+**`boundary connect` Credential Brokering Integration:** Additionally, we have started integration into the [boundary connect helpers](https://www.boundaryproject.io/docs/getting-started/connect-to-target), starting in this release with the Postgres helper; if the credential contains a username/password and boundary connect postgres is the helper being used, the command will automatically pass the credentials to the psql process.
+
+**Session Security Improvements:** Boundary workers will now close any existing proxy connections they're handling when they cannot make a status request to the worker. The timeout for this behavior is currenly 15 seconds.
+
+## What's Changed
+
+For more detailed information of all changes since 0.3.0, please refer to the [Changelog](https://github.com/hashicorp/boundary/blob/main/CHANGELOG.md)

website/data/docs-nav-data.json

@@ -357,6 +357,14 @@
           {
             "title": "v0.2.0",
             "path": "releases/release-notes/v0_2_0"
+          },
+          {
+            "title": "v0.3.0",
+            "path": "releases/release-notes/v0_3_0"
+          },
+          {
+            "title": "v0.4.0",
+            "path": "releases/release-notes/v0_4_0"
           }
         ]
       }