Update README and improve docker support (#294)

* improve python 3, docker support and README

- fix support for python 3.7
- simplify docker support
- update readme
- remove obsolete item-questions file

bin/docker-pokedex

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+curr_dir="$(pwd)"
+log_file="${curr_dir}/bin/docker-pokedex.log"
+
+if [[ "${1}" = "rebuild" ]] || [[ ! -f "${log_file}" ]]; then
+    docker build --rm -t veekun/pokedex ${curr_dir}
+    echo "$(date)" >> "${log_file}"
+
+    if [[ "${1}" = "rebuild" ]]; then
+        echo "Docker container rebuilt"
+        exit
+    fi;
+fi
+
+docker run -it --rm \
+    -e TERM=xterm-256color \
+    --name "pokedex-$(date +%Y%m%d-%H%M%S)" \
+    --mount type=bind,source="${curr_dir}/pokedex/data",target=/app/pokedex/data \
+    veekun/pokedex "${@}"