feat: add markdown preview

nvim/keymap.md

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+# List of keymaps
+
+## Space as leader
+
+## Debugging
+- F5: toggle breakpoint
+- F6: step over breakpoint
+- F7: step into breakpoint
+- F8: start debugging
+- F9: continue from breakpoint
+- F10: close debug UI
+
+## Nerd Tree
+- t: toggle open
+- f: focus tree
+
+## buffer switching
+- F1: next buffer (cycles)
+- F2: previous buffer (cycles)
+
+## formatting
+- F4: format this file
+
+## telescope
+- ff: find files
+- fg: live ripgrep
+- fb: find buffers
+- fh: help for functions etc
+
+## toggletrouble
+- Ctrl + f: show errors and warnings