Informing users about other installation methods available

[azzamsa]

Hi, 👋🏼

Should we inform users that they can use a different "package manager" than the one mentioned in https://iroh.computer/docs/install#package-managers?

Because some people are paranoid about running shell scripts from the internet on their local machines.

curl -fsSL https://sh.iroh.computer/install.sh | sh

We don't need to verbosely mention something like eget, but we can add to the docs that users can obtain the binary release manually or via their preferred package manager (e.g., eget).

🐡 ❯ cargo install iroh-cli
    Updating crates.io index
  Downloaded iroh-cli v0.18.0
  Downloaded 1 crate (87.3 KB) in 0.23s
     Ignored package `iroh-cli v0.18.0` is already installed, use --force to override

🐡 ❯ cargo binstall --no-confirm --no-symlinks --secure iroh-cli
 INFO resolve: Resolving package: 'iroh-cli'
 WARN The package iroh-cli v0.18.0 (x86_64-unknown-linux-musl) has been downloaded from github.com
 INFO This will install the following binaries:
 INFO   - iroh (iroh -> /home/user/.cargo/bin/iroh)
 INFO Installing binaries...
 INFO Done in 9.108947401s

🐡 ❯ eget n0-computer/iroh --to ~/.local/bin/
3 matches found: please select manually
(1) iroh-dns-server-v0.18.0-x86_64-unknown-linux-musl.tar.gz
(2) iroh-relay-v0.18.0-x86_64-unknown-linux-musl.tar.gz
(3) iroh-v0.18.0-x86_64-unknown-linux-musl.tar.gz
Enter selection number: 3
https://github.com/n0-computer/iroh/releases/download/v0.18.0/iroh-v0.18.0-x86_64-unknown-linux-musl.tar.gz
Downloading 100% [==========================================================] (12/12 MB, 3.595 MB/s)
Extracted `./iroh` to `/home/user/.local/bin/iroh`