Install httpgd 2.0.2 from archive

- https://github.com/nx10/httpgd/issues/204

base/latest.Dockerfile

@@ -419,6 +419,14 @@ RUN apt-get update \
       >> $(which radian)_; \
     echo "$(which radian) \"\${@}\"" >> $(which radian)_; \
   fi \
+  ## Install httpgd
+  ## Archived on 2025-02-14 as requires archived package 'unigd'.
+  && install2.r --error --skipinstalled -n $NCPUS \
+    unigd \
+    AsioHeaders \
+  && curl -sLO https://cran.r-project.org/src/contrib/Archive/httpgd/httpgd_2.0.2.tar.gz \
+  && R CMD INSTALL httpgd_2.0.2.tar.gz \
+  && rm httpgd_2.0.2.tar.gz \
   ## Install the R kernel for Jupyter, languageserver and httpgd
   && install2.r --error --deps TRUE --skipinstalled -n $NCPUS \
     IRkernel \