scripted-diff: replace ⛰ emoji with $ [skip ci]

-BEGIN VERIFY SCRIPT-
sed -i 's/⛰/$/g' $(git grep -l '⛰')
-END VERIFY SCRIPT-

docs/postgres.md

@@ -11,7 +11,7 @@ already enabled by default. The default release binaries or docker images can
 be used. To build from source, simply run:
 
 ```shell
-⛰  make install
+$  make install
 ```
 
 ## Configuring Postgres for LND