Reorganize docs folder

docs/checkcaptcha.txt

@@ -1,46 +0,0 @@
-mode=checkcaptcha only works on some boards!
-Until a proper api exists for checking what boards have this option, it will not be implemented.
-(that is, a proper way to check if "var preupload_captcha = true" was set)
-
-
-Send to the normal url "https://sys.4chan.org/" + board + "/post";
-Used in the extension for checking if the captcha is correct when submitting a large file
-
-POST:
-mode=checkcaptcha
-challenge=<normal captcha challenge>
-response=<user response>
-
-
-returns json:
-{
-    "token": "<captcha token>",
-    "error": "<error shown to the user>",
-    "fail": "<fail logged to console>"
-}
-
-In the extension:
-
-if (response.token) {
-    a = $.id("qrCapToken"), 
-    a.value = response.token, 
-    a.removeAttribute("disabled"), 
-    QR.submitDirect()
-} else {
-    if (response.error) {
-        QR.reloadCaptcha(), 
-        QR.btn.value = "Post", 
-        QR.showPostError(response.error)) 
-    } else {
-        if (response.fail) {
-            console.log(b.fail), 
-            QR.submitDirect()
-        }
-    }
-}
-
-qrCapToken is a hidden form field with the name captcha_token
-So when token exists in the json, send a normal reply with captcha_token
-
-
-