Move pages back into a "pages" folder

pages/osx/say.md

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+# say
+
+> Uses text to speech to speak through the default sound device
+
+- Speak a phrase aloud
+
+`say "I like to ride my bike."`
+
+- Speak a file aloud
+
+`say -f {{filename}}`
+
+- Create an AAC compressed audio file with the spoken text
+
+`say -o {{filename.m4a}} "Everyone loves iTunes"`
+
+- List the available voices
+
+`say -v '?'`