Update documentation links to reflect new paths (#1191)

This PR updates documentation links to reflect the new paths:

- Update `/settings/postgres` to `/integrations/postgresql`
- Update `/settings/integrations` to `/integrations/circleci`
- Update `/personal` to `/integrations/linear` for Linear configuration

Resolves CG-19221.

---

[💻 View my work](https://codegen.com/agent/trace/72383) • 👤 Initiated by
`famin@codegen.com` • [About Codegen](https://codegen.com)
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Co-authored-by: codegen-sh[bot] <131295404+codegen-sh[bot]@users.noreply.github.com>
Co-authored-by: Edo Pujol <ed@codegen.com>

Author: codegen-sh[bot]

docs/integrations/circleci.mdx

@@ -61,7 +61,7 @@ Connect your CircleCI account to Codegen to enable automatic check monitoring an
 <Card
   title="Connect CircleCI Account"
   icon="circle-play"
-  href="https://codegen.sh/integrations"
+  href="https://codegen.com/integrations/circleci"
 >
   Authorize Codegen to view your CircleCI check results and build logs.
 </Card>

docs/integrations/linear.mdx

@@ -60,7 +60,7 @@ Agents use the Linear integration to streamline project management:
 
 ### Overview
 
-Once you've enabled linear self-assign in the settings [page](https://www.codegen.com/settings/permissions), a codegen agent, that has been assigned to a linear issue (or has been tagged in one), can spawn child agents
+Once you've enabled linear self-assign in the settings [page](https://www.codegen.com/integrations/linear), a codegen agent, that has been assigned to a linear issue (or has been tagged in one), can spawn child agents
 by creating sub-issues and assigning itself to those sub-issues. For each sub-issue that codegen assigns to itself a child agent will be spawned and tasked with completing the sub-issue. Once the child agents are
 finished with their tasks they will notify their parent by sending it a message. The parent will then incorporate the child's work into its own as appropriate.
 

docs/integrations/postgres.mdx

@@ -13,7 +13,7 @@ Connect your database to Codegen by configuring your database credentials in the
 <Card
   title="Configure Database Access"
   icon="shield"
-  href="https://codegen.com/settings/postgres"
+  href="https://codegen.com/integrations/postgresql"
 >
   Set up your database connection credentials in the secure settings panel.
 </Card>
@@ -38,4 +38,4 @@ Agents leverage the Postgres integration to assist with data-related tasks:
 
 - **Data Exploration:** Safely query your database to understand data structures and relationships
 - **Report Generation:** Create data-driven reports and analytics
-- **Schema Analysis:** Provide insights about database design and optimization
+- **Schema Analysis:** Provide insights about database design and optimization