Restructure wiki to prepare for Helios64.

* Move all previous info into Helios4 subfolder
* Add helios64 subfolder
* Update all url link

Note: http server has been configure to ensure existing inbound link can 
still be resolved to the right page.

docs/helios4/files/uboot/u-boot-mainline-armbian-boot-script-support.patch

@@ -0,0 +1,46 @@
+From 61ddc75ecb082cba51fe7da4d0bc4c73c56abf38 Mon Sep 17 00:00:00 2001
+Message-Id: <61ddc75ecb082cba51fe7da4d0bc4c73c56abf38.1543232476.git.aditya@kobol.io>
+From: Aditya Prayoga <aditya@kobol.io>
+Date: Mon, 26 Nov 2018 19:07:49 +0800
+Subject: [PATCH] helios4: add boot-marvell.cmd backward compatibility
+
+On system that still use boot.scr derived from boot-marvell.cmd, new
+u-boot 2018 will failed load dtb and script due to missing some
+variables. This will render the system unbootable.
+
+These changes added the missing variables.
+
+Signed-off-by: Aditya Prayoga <aditya@kobol.io>
+---
+ include/config_distro_bootcmd.h | 1 +
+ include/configs/helios4.h       | 2 ++
+ 2 files changed, 3 insertions(+)
+
+diff --git a/include/config_distro_bootcmd.h b/include/config_distro_bootcmd.h
+index 373fee7..f469b2d 100644
+--- a/include/config_distro_bootcmd.h
++++ b/include/config_distro_bootcmd.h
+@@ -371,6 +371,7 @@
+ 	"boot_a_script="                                                  \
+ 		"load ${devtype} ${devnum}:${distro_bootpart} "           \
+ 			"${scriptaddr} ${prefix}${script}; "              \
++		"setenv boot_interface ${devtype};" \
+ 		"source ${scriptaddr}\0"                                  \
+ 	\
+ 	"scan_dev_for_scripts="                                           \
+diff --git a/include/configs/helios4.h b/include/configs/helios4.h
+index 6943378..299c58d 100644
+--- a/include/configs/helios4.h
++++ b/include/configs/helios4.h
+@@ -185,6 +185,8 @@
+ 	LOAD_ADDRESS_ENV_SETTINGS \
+ 	"fdtfile=" CONFIG_DEFAULT_DEVICE_TREE ".dtb\0" \
+ 	"console=ttyS0,115200\0" \
++	"loadaddr=0x02000000\0" \
++	"fdt_addr=" FDT_ADDR_R "\0" \
+ 	BOOTENV
+ 
+ #endif /* CONFIG_SPL_BUILD */
+-- 
+2.7.4
+