feat(users/Profpatsch): move eslint & prettier to toplevel

the linters & prettier config should apply to my whole subdir.

This is somewhat nasty, you have to `npm` in the toplevel dir before
it starts working, otoh dev tooling is dev time and I’m working on
these alone.

Change-Id: I96721f549b24a40b7ffbb2d310f37a40d2590b2b
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12573
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>

users/Profpatsch/.prettierrc

@@ -0,0 +1,8 @@
+{
+  "trailingComma": "all",
+  "tabWidth": 2,
+  "semi": true,
+  "singleQuote": true,
+  "printWidth": 90,
+  "arrowParens": "avoid"
+}