Search for zstd in home directory

This is possibly a solution for #2.

README.md

@@ -33,5 +33,5 @@ You can install `zstd` on your host with your usual package manager. On Ubuntu,
 
 On your **reMarkable** you can do `opkg install zstd` if you have [entware](https://github.com/evidlo/remarkable_entware) installed. If you don't you can use the binary provided in this repository. In general you shouldn't trust binaries strangers on the internet provide to you, but I provide the option if you don't want the hassle of installing entware.
 
-You can copy the binary to your remarkable with `scp zstd root@10.11.99.1:/home/root/zstd`.
+You can copy the binary to your remarkable with `scp zstd.arm root@10.11.99.1:~/zstd`.
 

reStream.sh

@@ -28,8 +28,8 @@ fallback_to_gzip() {
 # check if zstd is present on remarkable
 if ssh "$ssh_host" "[ -f /opt/bin/zstd ]"; then
     compress="/opt/bin/zstd"
-elif ssh "$ssh_host" "[ -f /home/root/zstd ]"; then
-    compress="/home/root/zstd"
+elif ssh "$ssh_host" "[ -f ~/zstd ]"; then
+    compress="~/zstd"
 fi
 
 # gracefully degrade to gzip if zstd is not present on remarkable or host