Installation docs update (#1416)

* Update README.md

Modified texts for steps 3-4

Signed-off-by: Jeremiah Howard <[email protected]>

* Added Install Instruction Screenshots

Capturing screenshots of the installation instructions of OSSF Scorecard

Signed-off-by: Jeremiah Howard <[email protected]>

* Delete images/configureScanningToolSS.png

Signed-off-by: Jeremiah Howard <[email protected]>

* Delete images/exploreWorkflowsSS.png

Signed-off-by: Jeremiah Howard <[email protected]>

* Delete images/searchingOSSF.png

Signed-off-by: Jeremiah Howard <[email protected]>

* Add files via upload

Signed-off-by: Jeremiah Howard <[email protected]>

* Updating the installation instructions 

Updated screenshots of the installation instructions, and added extra detailed steps. 

Co-authored-by: Silas Morgan <[email protected]> 
Co-authored-by: Kemon Bynum <[email protected]>
Co-authored-by: Jordin Jones <[email protected]>
Co-authored-by: Elijah Everett <[email protected]>
Co-authored-by: Emily Lovell <[email protected]>

Signed-off-by: Jeremiah Howard <[email protected]>

* Delete images/install04.png

Signed-off-by: Jeremiah Howard <[email protected]>

* Rename configureScanningToolSS.png to configurescantool.png

Signed-off-by: Jeremiah Howard <[email protected]>

* Rename exploreWorkflowsSS.png to exploreworkflow.png

Signed-off-by: Jeremiah Howard <[email protected]>

* Rename searchingOSSF.png to searchingossf.png

Signed-off-by: Jeremiah Howard <[email protected]>

* Incorporated suggested phrasing

Signed-off-by: Jeremiah Howard <[email protected]>

* Fixed numbering and indentation 

Signed-off-by: Jeremiah Howard <[email protected]>

---------

Signed-off-by: Jeremiah Howard <[email protected]>

README.md

@@ -48,25 +48,35 @@ GitHub Enterprise repositories are not supported.
 ## Installation
 
 ### Workflow Setup (Required)
-1) From your GitHub project's main page, click “Security” in the top ribbon.
+1. From your GitHub project's main page, click “Security” in the top ribbon.
 
-![image](/images/install01.png)
+   ![image](/images/install01.png)
 
-2) Select “Code scanning”.
+2. Select “Code scanning”.
 
-![image](/images/install02.png)
+   ![image](/images/install02.png)
 
-3) Then click "Add tool".
+3. Depending on whether the repository already has a scanning tool configured, you will see "Add tool" or "Configure scanning tool.
 
-![image](/images/install03.png)
+   a. If you see "Add tool" click it and skip step `b`.
 
-4) Choose the "OSSF Scorecard" from the list of workflows, and then click “Configure”.
+   ![image](/images/install03.png)
 
-![image](/images/install04.png)
+   If you see "Configure scanning tool" proceed to step `b`:
 
-5) Commit the changes.
+   ![image](/images/configurescantool.png)
 
-![image](/images/install05.png)
+   b. After clicking "Configure scanning tool", click "Explore workflows" underneath the "Other tools" section:
+
+   ![image](/images/exploreworkflow.png)
+
+5. Choose the "OSSF Scorecard" from the list of workflows below, and then click “Configure”. (To find it faster type "OSSF" in searchbox.)
+
+   ![image](/images/searchingossf.png)
+
+6. Commit the changes. (Your button might say "Commit changes..." instead of "Start commit", it does the same thing.)
+
+   ![image](/images/install05.png)
 
 ### Authentication with Fine-grained PAT (optional)
 Scorecard can run successfully with the workflow's default `GITHUB_TOKEN`, which is our recommended approach.