Replace modules name space

[shivarm]

Rename all files because it is not good practice to give modules name with space, we should use - between two words. So replace space with -

see the first module name and check all-https://github.com/distributethe6ix/70DaysOfServiceMesh/blob/main/70DaysExercises/01-Let's%20break%20down%20a%20Service%20Mesh.md

How to achieve

01-Let's break down a Service Mesh.md

to

01-Let's-break-down-Service-Mesh.md

@distributethe6ix WDYT?