remove empty file

replacement-gas-bottles/replacement-gas-bottles.md

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-permalink: /internal/lab/replacement-gas-bottles/
-shortcut: lab:replacement-gas-bottles
-redirect_from:
-  - /cards/lab:replacement-gas-bottles
-  - /internal/cards/lab:replacement-gas-bottles
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-# P5: Replacement of N2 or CO2 gas bottles (BT1/BT2) 
-