Add brief description of Digital Development of the RTC site

[ps2270]

@tcatapano Please compose a very brief description of the digital development of the RTC site, which will be entered under "Digital Development of the Research and Teaching Companion" on the About M&K page: https://cu-mkp.github.io/research-teaching-companion/about/

We'll just enter it directly onto the Index page for the About M&K page: https://github.com/cu-mkp/research-teaching-companion/blob/main/content/about.md

[ps2270]

@tcatapano @njr2128 I updated this on the "Introduction" webpage, but it needs correcting/revising.

[ps2270]

@tcatapano please read, revise, sign off on the following description of Digital Development, then close this issue:

On the Introduction page: https://cu-mkp.github.io/research-teaching-companion/introduction/

Webpage content and navigation for the Making and Knowing Project’s Research and Teaching Companion is built on the Hugo framework. Find the Companion on GitHub: https://cu-mkp.github.io/research-teaching-companion/.

[ps2270]

looks great. closing now.