fix(guide): simplify directory structure

guide/english/miscellaneous/learn-about-ruby-strings/index.md

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+---
+title: Learn About Ruby Strings
+---
+### Basics:
+
+*   Strings are a series of characters 'strung' together between quotes.
+*   Single or double quotes can be used to create strings in Ruby.
+*   Ruby does some extra evaluation on strings that are created with double quotes, such as:
+    *   Escaping characters: `\n`, `\t`, `\s`
+
+    *   Using variables and expressions inside: `#{variable or expression}`
+*   Strings with single quotes are rendered as they are, without any special considerations.
+
+## Examples:
+
+    "Hello World"
+    # is equivalent to:
+    'Hello World'
+
+    "This is line 1.\nAnd this is line 2."
+    # returns:
+    This is line 1.
+    And this is line 2.
+
+    name = "Batman"
+    "Hello, my name is #{name}!"
+    # returns:
+    Hello, my name is Batman!
+
+    # Note that for single quotes, ruby doesn't take special consideration for variables or backslashes:
+    'This is your name:\n#{name}'
+    # returns:
+    This is your name:\n#{name}
+
+## References:
+
+*   <a href='http://ruby-doc.org/core-2.2.0/String.html' target='_blank' rel='nofollow'>The official Ruby documentation for strings</a>.