fix: convert cf-kv and excalidraw-libraries from submodules to regular files

- Remove stale cloudflare-worker submodule entry from .gitmodules
- Remove .git dirs from cf-kv and excalidraw-libraries so Git tracks them as regular files
- Fixes 'No url found for submodule path cf-kv' CI error

excalidraw-libraries/stats/2021-09/2021-09-18.json

@@ -0,0 +1,55 @@
+{
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+  "aretecode-decision-flow-control": 32,
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+  "braweria-customer-journey-map": 2,
+  "cloud-cloud": 36,
+  "danimaniarqsoft-scrum-board": 2,
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+  "drwnio-storytelling": 2,
+  "dwelle-hearts": 2,
+  "ei-au-computers": 14,
+  "excacomp-mobile-kit": 2,
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+  "farisology-data-science": 3,
+  "ferminrp-awesome-icons": 46,
+  "ferminrp-awesome-slides": 3,
+  "ferminrp-gantt": 5,
+  "ferminrp-post-it": 3,
+  "franky47-apple-devices-frames": 2,
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+  "g-script-forms": 26,
+  "g-script-medias": 1,
+  "h7y-dropdowns": 5,
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+  "jhoughes-veeam": 3,
+  "kaligule-robots": 4,
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+  "lipis-stars": 6,
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+  "youritjang-azure-cloud-services": 1,
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+  "youritjang-stick-figures": 32
+}