README: Update package build recipe

as it is no longer possible to update extension component via INF editing (#1).

README.md

@@ -8,8 +8,5 @@ I have an old system that is not supported by OEM specific Realtek UAD drivers a
 ### How this package is built
 - Download latest `{version}-UAD-Nahimic*.zip` or  `{version}-UAD-WHQL-Nahimic*.zip` whichever is the newer version from `ftp://[email protected]/Realtek`;
 - Extract `RTKVHD64.sys`,`RTAIODAT.DAT`,`HDXRT.inf` and `hdxrt.cat` from source codec folder to destination codec folder;
-- Extract `hdxrtext.cat` from extension folder to codec folder (we merge codec and extension folders for convencience);
-- Copy date and version from the .inf file present in extension folder;
-- Grab latest copy of [HDX_GenericExt_RTK.inf](https://github.com/alanfox2000/realtek-universal-audio-driver/blob/master/UAD/Realtek/CodecExtOem_RTK_8614/HDX_GenericExt_RTK.inf) and save it to Codec folder;
-- Modify date and version in `HDX_GenericExt_RTK.inf` with what was copied before;
-- Extract hsa, apo and service folders.
+- Grab [HDX_GenericExt_RTK.inf and hdxrtext.cat](https://github.com/alanfox2000/realtek-universal-audio-driver/blob/master/UAD/Realtek/CodecExtOem_RTK_8614) and save them to a folder called CodecExtOem_RTK;
+- Extract RealtekAPO, RealtekHSA and RealtekService folders.