doc: update documents.

1. update ReadME.md.
2. update User Manual.

4 files changed, 6 insertions, 16 deletions

diff --git a/README.md b/README.md
index 2accd550..169801a5 100644
--- a/README.md
+++ b/README.md
@@ -21,15 +21,11 @@ it to guarantee the authenticity of your information.
 [Languages Supported](#languages-support) by GpgFrontend that are widely used in most countries and regions around the
 world, including English, Chinese, French, Russian, German, Spanish, Portuguese, Arabic, etc.
 
-**Notice:** GpgFrontend does not provide an embedded [gnupg](https://gnupg.org/) (gpg) binary and needs to be installed
-by the user. **This is to ensure safety and avoid code or binary files involved in encryption and decryption being
-implanted in the back-door during the delivery process.**
+GpgFrontend is permanently free, but you can also "donate" it through the STAR project. Thanks!
 
-GpgFrontend is permanently free, and you can also "donate" it through the STAR project. Thanks!
-
-[>> Overview <<](https://www.gpgfrontend.pub/#/overview) |
-[>> Code & Binary Security <<](https://gpgfrontend.pub/#/about/code-binary-verify)
-| [>> Track Development <<](https://global.git.codesdream.com/)
+[>> Download <<](https://github.com/saturneric/GpgFrontend/releases/latest)
+| [>> User Manual <<](https://www.gpgfrontend.pub/#/overview)
+| [>> Developer Document <<](https://doxygen.gpgfrontend.pub/)
 
 <img src="https://github.com/saturneric/Blob/blob/master/screenshots/main-ubuntu.png?raw=true" alt="Ubuntu Main Screenshot"/>
 
diff --git a/manual/manual/advance-key-opera.md b/manual/manual/advance-key-opera.md
deleted file mode 100644
index c8b646a4..00000000
--- a/manual/manual/advance-key-opera.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Advance Key Operation
-
-Some advanced key operations will be introduced in this module.
\ No newline at end of file
diff --git a/manual/manual/email-operations.md b/manual/manual/email-operations.md
deleted file mode 100644
index 6d460e60..00000000
--- a/manual/manual/email-operations.md
+++ /dev/null
@@ -1 +0,0 @@
-# Email Operations
\ No newline at end of file
diff --git a/manual/quick-start.md b/manual/quick-start.md
index f3850100..4793131a 100644
--- a/manual/quick-start.md
+++ b/manual/quick-start.md
@@ -55,9 +55,6 @@ command line tool. **In general, it is recommended to install versions of GnuPG
 
 ### Windows (No Setup)
 
-0. If you haven't installed gnupg,
-   please [Download](https://gnupg.org/ftp/gcrypt/binary/gnupg-w32-2.3.1_20210420.exe) `gnupg-w32-******.exe` and
-   install it.
 1. [Download](https://github.com/saturneric/GpgFrontend/releases/latest)`GpgFrontend-*******-Windows-NoSetup.zip`
 2. Unzip `GpgFrontend-*******-Windows-NoSetup.zip`
 3. Go into the directory and double click `GpgFrontend.exe`.
@@ -69,10 +66,11 @@ command line tool. **In general, it is recommended to install versions of GnuPG
 
 ### macOS
 
+0. Install gnupg using homebrew.
 1. [Download](https://github.com/saturneric/GpgFrontend/releases) `GpgFrontend-*******-x86_64.dmg`
 2. Double-Click GpgFrontend.dmg to load it
     - macOS will automatically decompress the zip file and then you will be able to see the dmg
-3. Double click and run it. All published app packages have passed Apple's check, which means you can open it directly.
+3. Double click and run it. All published app packages have passed Apple's binary check, which means you can open it directly.
 4. If it satisfies you, you can drag it into your Application folder.
 
 #### Debian/Ubuntu/CentOS (AppImage)