chore(neovim): move from iron.nvim to toggleterm

Usually I use terminal to access `repl` available in a docker container,
or a remote one available in kubernetes or virtual machine.

Dockerfile

@@ -174,16 +174,3 @@ RUN ${XDG_DATA_HOME}/rtx/bin/rtx plugins install \
     kubectl \
     poetry \
     terraform
-
-# configure openssl 1.1
-# this is needed to compile older erlang versions
-# example: KERL_CONFIGURE_OPTIONS="-with-ssl=${HOME}/.local/lib/ssl" asdf install
-RUN mkdir -p ${HOME}/.local/src \
-  && cd ${HOME}/.local/src \
-  && wget https://www.openssl.org/source/openssl-1.1.1m.tar.gz \
-  && tar -xzf openssl-1.1.1m.tar.gz \
-  && cd openssl-1.1.1m \
-  && ./config --prefix=${HOME}/.local/lib/ssl --openssldir=${HOME}/.local/lib/ssl shared zlib \
-  && make \
-  # && make test \
-  && make install