Exclude template.md from install/update (#333)

This should fix an issue with the install/update script, since the infra
template also installs/updates this file.

Tested the install script locally:

![CleanShot 2024-05-01 at 10 25
56@2x](https://github.com/navapbc/template-application-nextjs/assets/371943/66a091f2-aec1-4fb7-8fe1-f09f27408272)

Author: sawyerh

template-only-bin/install-template.sh

@@ -25,3 +25,4 @@ echo "Remove files relevant only to template development"
 rm .github/workflows/template-only-*
 rm -rf .github/ISSUE_TEMPLATE
 rm -rf docs/decisions/template
+rm docs/decisions/template.md

template-only-bin/update-template.sh

@@ -37,6 +37,7 @@ echo "Applying patch"
 # Note: Keep this list in sync with the removed files in install-template.sh
 EXCLUDE_OPT="--exclude=.github/workflows/template-only-* \
   --exclude=.github/ISSUE_TEMPLATE \
+  --exclude=docs/decisions/template.md \
   --exclude=docs/decisions/template"
 git apply $EXCLUDE_OPT --allow-empty template-application-nextjs/patch