Fix linking rst

[mehtamohit013]

Describe your changes

• Insert RST in markdown
• Linking two diff rst files

Issue number

Closes #70

Checklist before requesting a review

• [X] Performed a self-review of my code
• [X] Formatted my code with pkgmt format
• [X] Added tests (when necessary).
• [X] Added docstring documentation and update the changelog (when needed)

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:books: Documentation preview :books:: https://ploomber-engine--76.org.readthedocs.build/en/76/

[mehtamohit013]

@edublancas @idomic Able to link to the file. Does the below format suffice?

[idomic]

@mehtamohit013 Yeah that works great! Please go over the PR, make sure you didn't forget some of those (I saw 2 that are missing on the user guide)

[mehtamohit013]

@mehtamohit013 Yeah that works great! Please go over the PR, make sure you didn't forget some of those (I saw 2 that are missing on the user guide)

@idomic Yeah, added in all three markdowns: running, runtime and memory

[idomic]

lgtm