📝 Add Nodes to developer documentation

[shnizzedy]

Fixes

Related to FCP-INDI/C-PAC#1404 by @shnizzedy

Description

This PR adds documentation about Nipype Nodes to the C-PAC developer docs, specifically how to use the mem_gb and n_procs initialization parameters.

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Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the source branch of the repository.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I updated the changelog.
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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