chore: update install instructions

Makefile

@@ -17,9 +17,6 @@ pex:
 	poetry export --without-hashes > ${REQUIREMENTS}
 	poetry run pex -r ${REQUIREMENTS} -e authum.cli:main -o dist/athm .
 
-install:
-	cp dist/athm /usr/local/bin
-
 release:
 	$(eval VERSION=`poetry version -s`)
 	git tag -a v${VERSION} -m "Release version ${VERSION}"

README.md

@@ -22,24 +22,15 @@ SAML/OIDC identity and service providers. Authum is the successor to
 ## Installation
 
 1. Install [Poetry](https://python-poetry.org)
+    - `brew install poetry`
 1. Clone this repository
 1. `cd /path/to/repository`
 1. `poetry install`
 1. `make pex`
-1. `make install`
+1. Copy `dist/athm` to a location in $PATH
+    - Homebrewers `cp dist/athm $(eval brew --prefix)/bin`
 1. `rehash` to update binaries in `$PATH`
 
-### Graphical Prompts
-
-[tkinter](https://docs.python.org/3/library/tkinter.html) is required for
-graphical prompts.
-
-#### Homebrew on macOS
-
-```sh
-brew install python-tk
-```
-
 ## Example Usage: Generate Temporary IAM Credentials via Identity Provider Credentials
 
 See [aws](authum/plugins/aws/) plugin documentation.