Closes #13586

In the pull request process for CONTRIBUTING.md, the steps previously linked to high-level documentation. Needed to be updated to architecture and components and its corresponding link.

Steps to test

To test this feature, check if the link to leads to the the architecture and components devdocs page when reviewing the 'Pull Request Process' section on CONTRIBUTING.md. Note: While I did see the mention for the .md link, I used .html since CONTRIBUTING.md is primarily viewed on Github. Users clicking on .md link would receive a 404 error. This link format matches other documentation links in the same file. If any changes are needed, or if there any issues due to this I am welcome to change it accordingly.

Users should see the above screenshot when clicking the corresponding link.

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• [/] Change in CHANGELOG.md described in a way that is understandable for the average user (if change is visible to the user)
• [/] Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (if change is visible to the user)
• Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.