ci: remove deprecated submodule code

docs/developing/guides/api/how-to-setup-api-in-a-local-instance.mdx

@@ -16,9 +16,6 @@ To test API in your local instance, you have the following pre-requisites:
         1a1f8138-0bfc-4f37-b4af-1e24fd145839
         ```
     </Step>
-    <Step title="Install API submodule">
-        Next, you need to install API submodule by following the instructions provided in [API submodule](/developing/local-development#api)
-    </Step>
     <Step title="Start development server and create API key">
         Start the cal.com server using `yarn dev` on localhost and create the test API keys by visiting `/settings/developer/api-keys`
     </Step>

docs/self-hosting/docker.mdx

@@ -29,12 +29,6 @@ Note: `docker compose` without the hyphen is now the primary method of using doc
     cd calcom-docker
     ```
 
-3. Update the calcom submodule
-
-    ```
-    git submodule update --remote --init
-    ```
-
 4. Rename `.env.example` to `.env` and then update `.env`
 
 5. Build and start Cal.com via docker compose
@@ -67,20 +61,8 @@ These variables must be provided at the time of the docker build, and can be pro
 
 * NEXTAUTH_SECRET
 
-### Git Submodules
-
-This repository uses a git submodule.
-
-To update the calcom submodule, use the following command:
-
-```
-git submodule update --remote --init
-```
-
-For more advanced usage, please refer to the git documentation: [https://git-scm.com/book/en/v2/Git-Tools-Submodules](https://git-scm.com/book/en/v2/Git-Tools-Submodules)
-
 ### Troubleshooting
 
 * SSL edge termination: If running behind a load balancer which handles SSL certificates, you will need to add the environmental variable `NODE_TLS_REJECT_UNAUTHORIZED=0` to prevent requests from being rejected. Only do this if you know what you are doing and trust the services/load-balancers directing traffic to your service.
 
-* Failed to commit changes: Invalid 'prisma.user.create()': Certain versions may have trouble creating a user if the field `metadata` is empty. Using an empty json object `{}` as the field value should resolve this issue. Also, the `id` field will autoincrement, so you may also try leaving the value of `id` as empty.
+* Failed to commit changes: Invalid 'prisma.user.create()': Certain versions may have trouble creating a user if the field `metadata` is empty. Using an empty json object `{}` as the field value should resolve this issue. Also, the `id` field will autoincrement, so you may also try leaving the value of `id` as empty.