[docs] moved into folders

docs/user/setup/docs.user.setup.letter_head.md

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+---
+{
+	"_label": "Letter Head"
+}
+---
+You can create / manage Letter Heads from:
+
+> Setup > Branding and Printing > Letter Heads
+
+- Create an image with your logo, brand and other information that you want to put on your letter head.
+- Attach the image in your Letter Head record and click on “Set From Image” to automatically generate the HTML required for this Letter Head.
+- If you want to make this the default letter head, click on “Is Default”.
+
+Thats it! Your letter head will now appear in all Prints and Emails of documents.