issue templates to steer the public elsewhere

.github/ISSUE_TEMPLATE/unicodedata.md

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+---
+name: Feedback on Unicode data, properties, algorithms
+about: Report bugs and suggestions elsewhere
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## If you have access to the Unicode-internal PAG repo
+Please submit a PAG issue there.
+
+## Otherwise
+Please submit feedback via https://www.unicode.org/reporting.html

.github/ISSUE_TEMPLATE/unicodetools.md

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+---
+name: Feedback on the Unicode Tools code and processes
+about: Mostly-Unicode-internal Unicode Tools
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+(Bugs, suggestions, ideas for Unicode Tools code, for its maintainers, their processes, etc.)
+
+(These tools are publicly visible but treated as an implementation detail of PAG.
+Data is published at https://www.unicode.org/Public/ -- feedback: https://www.unicode.org/reporting.html)