fix(guide): simplify directory structure

guide/english/go/the-zero-value/index.md

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+---
+title: The Zero Value
+---
+
+## The Zero Value
+Understanding some zero values inside Golang:
+1. false for booleans
+2. 0 for integers
+3. 0.0 for floats
+4. "" for strings
+5. nil for 
+   * pointers
+   * functions
+   * interfaces
+   * slices
+   * channels
+   * maps
+
+Please, use short declaration operator as much as possible.
+
+* Use var for:
+  * zero value
+  * package scope
+  
+  ### More Information