docs: reorganize installation documentation structure

docs/docs/installation/qodo_merge.md

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+Qodo Merge is a versatile application compatible with GitHub, GitLab, and BitBucket, hosted by QodoAI.
+See [here](https://qodo-merge-docs.qodo.ai/overview/pr_agent_pro/) for more details about the benefits of using Qodo Merge.
+
+A complimentary two-week trial is provided to all new users. Following the trial period, user licenses (seats) are required for continued access.
+To purchase user licenses, please visit our [pricing page](https://www.qodo.ai/pricing/).
+Once subscribed, users can seamlessly deploy the application across any of their code repositories.
+
+## Install Qodo Merge for GitHub
+
+### GitHub Cloud
+
+Qodo Merge for GitHub cloud is available for installation through the [GitHub Marketplace](https://github.com/apps/qodo-merge-pro).
+
+![Qodo Merge](https://codium.ai/images/pr_agent/pr_agent_pro_install.png){width=468}
+
+### GitHub Enterprise Server
+
+To use Qodo Merge application on your private GitHub Enterprise Server, you will need to contact us for starting an [Enterprise](https://www.codium.ai/pricing/) trial.
+
+### GitHub Open Source Projects
+
+For open-source projects, Qodo Merge is available for free usage. To install Qodo Merge for your open-source repositories, use the following marketplace [link](https://github.com/apps/qodo-merge-pro-for-open-source).
+
+## Install Qodo Merge for Bitbucket
+
+###  Bitbucket Cloud
+
+Qodo Merge for Bitbucket Cloud is available for installation through the following [link](https://bitbucket.org/site/addons/authorize?addon_key=d6df813252c37258)
+
+![Qodo Merge](https://qodo.ai/images/pr_agent/pr_agent_pro_bitbucket_install.png){width=468}
+
+### Bitbucket Server
+
+To use Qodo Merge application on your private Bitbucket Server, you will need to contact us for starting an [Enterprise](https://www.codium.ai/pricing/) trial.
+
+
+## Install Qodo Merge for GitLab (Teams & Enterprise)
+
+Since GitLab platform does not support apps, installing Qodo Merge for GitLab is a bit more involved, and requires the following steps:
+
+#### Step 1
+
+Acquire a personal, project or group level access token. Enable the “api” scope in order to allow Qodo Merge to read pull requests, comment and respond to requests.
+
+<figure markdown="1">
+![Step 1](https://www.codium.ai/images/pr_agent/gitlab_pro_pat.png){width=750}
+</figure>
+
+Store the token in a safe place, you won’t be able to access it again after it was generated.
+
+#### Step 2
+
+Generate a shared secret and link it to the access token. Browse to [https://register.gitlab.pr-agent.codium.ai](https://register.gitlab.pr-agent.codium.ai).
+Fill in your generated GitLab token and your company or personal name in the appropriate fields and click "Submit".
+
+You should see "Success!" displayed above the Submit button, and a shared secret will be generated. Store it in a safe place, you won’t be able to access it again after it was generated.
+
+#### Step 3
+
+Install a webhook for your repository or groups, by clicking “webhooks” on the settings menu. Click the “Add new webhook” button.
+
+<figure markdown="1">
+![Step 3.1](https://www.codium.ai/images/pr_agent/gitlab_pro_add_webhook.png)
+</figure>
+
+In the webhook definition form, fill in the following fields:
+URL: https://pro.gitlab.pr-agent.codium.ai/webhook
+
+Secret token: Your QodoAI key
+Trigger: Check the ‘comments’ and ‘merge request events’ boxes.
+Enable SSL verification: Check the box.
+
+<figure markdown="1">
+![Step 3.2](https://www.codium.ai/images/pr_agent/gitlab_pro_webhooks.png){width=750}
+</figure>
+
+#### Step 4
+
+You’re all set!
+
+Open a new merge request or add a MR comment with one of Qodo Merge’s commands such as /review, /describe or /improve.