Update _sidebar.md

Author: shomykohai

_sidebar.md

@@ -1,12 +1,12 @@
-- [About](README.md)
+- [About](/README.md)
 - Info
-    - [Device Info](info/device-info.md)
-    - [Fastboot](info/fastboot.md)
-    - [Firmware rollback](info/firmware-rollback.md)
-    - [AVB (Android Verify Boot)](info/avb.md)
+    - [Device Info](/info/device-info.md)
+    - [Fastboot](/info/fastboot.md)
+    - [Firmware rollback](/info/firmware-rollback.md)
+    - [AVB (Android Verify Boot)](/info/avb.md)
 - Development
-    - [Bootloader](dev/bootloader.md)
-    - [Partitions](dev/partitions.md)
-    - [Metamode](dev/metamode.md)
-    - [Testpoints](dev/testpoints.md)
-    - [Tools](dev/tools.md)
+    - [Bootloader](/dev/bootloader.md)
+    - [Partitions](/dev/partitions.md)
+    - [Metamode](/dev/metamode.md)
+    - [Testpoints](/dev/testpoints.md)
+    - [Tools](/dev/tools.md)