fix(snippets): add UNNUMBERED notoc to sub-headings in adr/meeting/weekly

Sub-headings (Problem statement, Decision, etc.) should not appear in
TOC when using #+OPTIONS: toc:N. Main template heading remains in TOC.

snippets/org-mode/weekly

@@ -5,10 +5,22 @@
 `(make-string (1+ (or (org-current-level) 0)) ?*)` Weekly Review — `(format-time-string "W%V %Y")`
 
 `(make-string (+ 2 (or (org-current-level) 0)) ?*)` Done this week
+:PROPERTIES:
+:UNNUMBERED: notoc
+:END:
 
 `(make-string (+ 2 (or (org-current-level) 0)) ?*)` In progress
+:PROPERTIES:
+:UNNUMBERED: notoc
+:END:
 
 `(make-string (+ 2 (or (org-current-level) 0)) ?*)` Blocked
+:PROPERTIES:
+:UNNUMBERED: notoc
+:END:
 
 `(make-string (+ 2 (or (org-current-level) 0)) ?*)` Next week focus
+:PROPERTIES:
+:UNNUMBERED: notoc
+:END:
 $0