Remove StackOverflow badge as URL resolves only when logged in

This came up in CRAN checks for 1.0.12 but was not deemed grave enough to
hold the release, yet expected to be addressed going forward.

ChangeLog

@@ -1,3 +1,8 @@
+2024-01-09  Dirk Eddelbuettel  <edd@debian.org>
+
+	* README.md: Remove StackOverflow badge which only works for
+	logged-in users and is unsuitable for the README
+
 2024-01-08  Dirk Eddelbuettel  <edd@debian.org>
 
         * DESCRIPTION (Date, Version): Release 1.0.12

README.md

@@ -12,7 +12,6 @@
 [![CRAN use](https://jangorecki.gitlab.io/rdeps/Rcpp/CRAN_usage.svg?sanitize=true)](https://cran.r-project.org/package=Rcpp)
 [![CRAN indirect](https://jangorecki.gitlab.io/rdeps/Rcpp/indirect_usage.svg?sanitize=true)](https://cran.r-project.org/package=Rcpp)
 [![BioConductor use](https://jangorecki.gitlab.io/rdeps/Rcpp/BioC_usage.svg?sanitize=true)](https://cran.r-project.org/package=Rcpp)
-[![StackOverflow](https://img.shields.io/badge/stackoverflow-rcpp-orange.svg)](https://stackoverflow.com/questions/tagged/rcpp)
 [![JSS](https://img.shields.io/badge/JSS-10.18637%2Fjss.v040.i08-brightgreen)](https://dx.doi.org/10.18637/jss.v040.i08)
 [![Springer useR!](https://img.shields.io/badge/Springer%20useR!-10.1007%2F978--1--4614--6868--4-brightgreen)](https://www.amazon.com/gp/product/1461468671/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1461468671&linkCode=as2&tag=rcpp-20&linkId=3P5LNUWOAQ2YMEJ6)
 [![TAS](https://img.shields.io/badge/TAS-10.1080%2F00031305.2017.1375990-brightgreen)](https://dx.doi.org/10.1080/00031305.2017.1375990)