change count in README when updating images

Include the total number of images in the README file, updating it each
time a new batch of images is pushed.

README.md

@@ -1,10 +1,12 @@
 # artflow.ai portraits
 
-This is a collection of portraits scraped from artflow.ai. The images are
-licensed by the copyright holder ([artflow.ai](https://artflow.ai/)) under the
-[Creative Commons Attribution](https://creativecommons.org/licenses/by/4.0/)
-license, but are not made available by the copyright holder in a format that can
-be easily consumed in bulk.
+This is a collection of 0 portraits scraped from artflow.ai.
+
+The images are licensed by the copyright holder
+([artflow.ai](https://artflow.ai/)) under the [Creative Commons
+Attribution](https://creativecommons.org/licenses/by/4.0/) license, but are not
+made available by the copyright holder in a format that can be easily consumed
+in bulk.
 
 The images in this repository are automatically collected, converted from WEBP
 to JPEG, and saved according to the following format:

commit.sh

@@ -5,13 +5,19 @@ cd "$(dirname "$0")" || return
 
 source .env
 
+git pull
+
 git add images
 
+sed -i "/^This is a collection/c This is a collection of $(find images -type f | wc -l) portraits scraped from artflow.ai." README.md
+
+git add README.md
+
 git \
   -c user.name="$USER_NAME"\
   -c user.email="$USER_EMAIL" \
   -c user.signingkey="$USER_SIGNINGKEY" \
 commit \
-  -m "$(date +%Y-%m-%d): add $(git status --porcelain=v1 | grep -c '^A ') images"
+  -m "$(date +%Y-%m-%d): add $(git status --porcelain=v1 | grep -c '^A  images') images"
 
 git push