add render script for reproducible screenshots

scripts/screens.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+render_script="$script_dir/render.sh"
+
+biomes=(alpine badlands chaparral savanna grassland tundra)
+modes=(light dark)
+
+for biome in "${biomes[@]}"; do
+    for mode in "${modes[@]}"; do
+        symconf config -m "$mode" -s "default-$biome-monobiome"
+        sleep 5
+        "$render_script" 800 600 nvim \
+            +':highlight Cursor blend=100' \
+            +':set guicursor=n:block-Cursor' \
+            +':silent! setlocal nonumber nocursorline signcolumn=no foldcolumn=no' \
+            examples/runner.py