Stop git handling binary images files as text

When cloning the repository from scratch, 4 files are coming up as modified and attempting to run `checkout` to get to a clean state fails due to the rule in this file setting all files (`*`) to be processed by Git as `text` with automatic EOL processing. See the below for what happens:

```
davidalger:05:13 PM:/server/proj$ git clone https://github.com/stefanprodan/dockprom
Cloning into 'dockprom'...
remote: Enumerating objects: 605, done.
remote: Total 605 (delta 0), reused 0 (delta 0), pack-reused 605
Receiving objects: 100% (605/605), 1.49 MiB | 328.00 KiB/s, done.
Resolving deltas: 100% (343/343), done.
davidalger:05:14 PM:/server/proj$ cd dockprom/
warning: CRLF will be replaced by LF in screens/Grafana_Docker_Containers.png.
The file will have its original line endings in your working directory
davidalger:05:14 PM:/server/proj/dockprom (master *) $ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

	modified:   screens/Grafana_Docker_Containers.png
	modified:   screens/Grafana_Docker_Host.png
	modified:   screens/Grafana_Prometheus.png
	modified:   screens/Slack_Notifications.png

no changes added to commit (use "git add" and/or "git commit -a")
warning: CRLF will be replaced by LF in screens/Grafana_Docker_Containers.png.
The file will have its original line endings in your working directory
davidalger:05:14 PM:/server/proj/dockprom (master *) $ git checkout .
Updated 4 paths from the index
warning: CRLF will be replaced by LF in screens/Grafana_Docker_Containers.png.
The file will have its original line endings in your working directory
davidalger:05:14 PM:/server/proj/dockprom (master *) $ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

	modified:   screens/Grafana_Docker_Containers.png
	modified:   screens/Grafana_Docker_Host.png
	modified:   screens/Grafana_Prometheus.png
	modified:   screens/Slack_Notifications.png

no changes added to commit (use "git add" and/or "git commit -a")
warning: CRLF will be replaced by LF in screens/Grafana_Docker_Containers.png.
The file will have its original line endings in your working directory
davidalger:05:14 PM:/server/proj/dockprom (master *) $ vi .gitattributes 
davidalger:05:14 PM:/server/proj/dockprom (master *) $ git checkout screens/
Updated 4 paths from the index
davidalger:05:14 PM:/server/proj/dockprom (master *) $ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

	modified:   .gitattributes

no changes added to commit (use "git add" and/or "git commit -a")
davidalger:05:14 PM:/server/proj/dockprom (master *) $ 
```