Fix dangling links in mysql, add TOC in mysql, incorporate network review

courses/databases_sql/intro.md

@@ -1,6 +1,10 @@
 # Relational Databases
 
-### What to expect from this training
+### Prerequisites
+*   Complete [Linux course](/linux_basics/intro/)
+*   Install Docker (for lab section)
+
+### What to expect from this course
 You will have an understanding of what relational databases are, their advantages, and some MySQL specific concepts.
 
 ### What is not covered under this course
@@ -13,9 +17,13 @@ You will have an understanding of what relational databases are, their advantage
 ### Introduction
 The main purpose of database systems is to manage data. This includes storage, adding new data, deleting unused data, updating existing data, retrieving data within a reasonable response time, other maintenance tasks to keep the system running etc.
 
-### Prerequisites
-*   Complete [Linux course](/linux_basics/intro/)
-*   Install Docker (for lab section)
-
 ### Pre-reads
-[RDBMS Concepts](https://beginnersbook.com/2015/04/rdbms-concepts/)
+[RDBMS Concepts](https://beginnersbook.com/2015/04/rdbms-concepts/)
+
+### Course Contents
+- [Key Concepts](https://linkedin.github.io/school-of-sre/databases_sql/concepts/)
+- [MySQL Architecture](https://linkedin.github.io/school-of-sre/databases_sql/mysql/#mysql-architecture)
+- [InnoDB](https://linkedin.github.io/school-of-sre/databases_sql/innodb/)
+- [Operational Concepts](https://linkedin.github.io/school-of-sre/databases_sql/operations/)
+- [Lab](https://linkedin.github.io/school-of-sre/databases_sql/lab/)
+- [Further Reading](https://linkedin.github.io/school-of-sre/databases_sql/conclusion/#further-reading)