ENH: Added 2 blogs related to nx-parallel and NetworkX

[Schefflera-Arboricola]

• The main subject relates to at least one project affiliated to the Scientific Python Ecosystem.
• I have the right to publish the content under BSD 3-Clause License for the code and Creative Common CC-BY-4.0 License for the text.
• Images have been compressed using a tool like pngquant.

[jarrodmillman]

Thanks!! It looks like we will need a new theme release before merging this (I will take care of that soon).

I also will add a figure shortcode to complement the image shortcode:

• https://theme.scientific-python.org/shortcodes/#image

I had one already, but need to review something before going forward.

I will review this PR soon and provide comments/suggestions.

[stefanv]

Thanks for these posts, @Schefflera-Arboricola! I'm reviewing them now, hoping to get them merged ASAP. Do you want to keep the original dates on the post, or update the dates so they appear higher up on the list?