docs: update README with Chapter 8 badge, nav, and progr

Author: srikanthbaride

.github/workflows/ch2.yml

@@ -1,4 +1,4 @@
-name: ch2 tests
+name: ch2
 
 on:
   push:

.github/workflows/ch3.yml

@@ -1,4 +1,4 @@
-name: ch3 tests
+name: ch3
 on:
   push:
     branches: [ "main" ]

.github/workflows/ch4.yml

@@ -1,4 +1,4 @@
-name: ch4 tests
+name: ch4
 
 on:
   push:

.github/workflows/ch5.yml

@@ -1,4 +1,4 @@
-name: ch5 tests
+name: ch5
 
 on:
   push: