docs: Update installation method

Author: sorairolake

crates/cli/README.md

@@ -27,12 +27,6 @@ cargo install abcrypt-cli
 If you want to enable optimizations such as LTO, set them using [environment
 variables].
 
-### Via a package manager
-
-| OS    | Package manager | Command                                    |
-| ----- | --------------- | ------------------------------------------ |
-| _Any_ | [Homebrew]      | `brew install sorairolake/tap/abcrypt-cli` |
-
 ### From binaries
 
 The [release page] contains pre-built binaries for Linux, macOS and Windows.
@@ -145,7 +139,6 @@ licensing information.
 [license-badge]: https://img.shields.io/crates/l/abcrypt-cli?style=for-the-badge
 [abcrypt encrypted data format]: ../../docs/spec/FORMAT.adoc
 [environment variables]: https://doc.rust-lang.org/cargo/reference/environment-variables.html#configuration-environment-variables
-[Homebrew]: https://brew.sh/
 [release page]: https://github.com/sorairolake/abcrypt/releases
 [BUILD.adoc]: BUILD.adoc
 [`abcrypt(1)`]: https://sorairolake.github.io/abcrypt/book/cli/man/man1/abcrypt.1.html

docs/book/modules/cli/pages/install.adoc

@@ -4,7 +4,6 @@
 
 = Installation
 :environment-variables-url: https://doc.rust-lang.org/cargo/reference/environment-variables.html#configuration-environment-variables
-:brew-url: https://brew.sh/
 :release-page-url: https://github.com/sorairolake/abcrypt/releases
 
 == From source
@@ -17,16 +16,6 @@ cargo install abcrypt-cli
 If you want to enable optimizations such as LTO, set them using
 {environment-variables-url}[environment variables].
 
-== Via a package manager
-
-|===
-|OS |Package manager |Command
-
-|_Any_
-|{brew-url}[Homebrew]
-|`brew install sorairolake/tap/abcrypt-cli`
-|===
-
 == From binaries
 
 The {release-page-url}[release page] contains pre-built binaries for Linux,