slightly reorganize REDCap section

[wibeasley]

@skadauke, @RaymondBalise, @spgarbet, @jcarmezim, @pbchase, @agdamsbo, @the-mayer please

• see if you agree with the changes I'm attaching to this issue (in the next few minutes).

• tell me if other packages should be included. The task views can include non-CRAN packages, but only if they're really important to the ecosystem.

• Source: https://github.com/cran-task-views/WebTechnologies/blob/main/WebTechnologies.md

• Rendered (most nights): https://cran.r-project.org/web/views/WebTechnologies.html

[spgarbet]

These look fine to me.