docs: general fixes across docs (#4737)

* docs: general fixes across docs

* added deploy button to railway

* fix eslint errors

* fixes

docs/content/development/modules/create.mdx

@@ -20,9 +20,11 @@ Before you start implementing the custom functionality in your module, it's reco
 ```
 custom-module
 |
-|___ index.ts
-|
-|___ services // directory
+|___ src
+    |
+    |___ index.ts
+    |
+    |___ services // directory
 ```
 
 The directory can be an NPM project, but that is optional. `index.ts` acts as an entry point to your Module. You'll learn about its content in  a later step. The `service` directory will hold your custom services. If you're adding other resources you can add other directories for them. For example, if you're adding an entity you can add a `models` directory.
@@ -219,12 +221,14 @@ For example, consider you have the following file structure:
 |
 |___ custom-module
 |    |
-|    |___ index.ts
-|    |
-|    |___ services
-|    |    |
-|    |    |___ custom-service.ts
-|    |___ // more files
+|    |___ src
+|        |
+|        |___ index.ts
+|        |
+|        |___ services
+|        |    |
+|        |    |___ custom-service.ts
+|        |___ // more files
 |
 |
 |___ medusa-backend
@@ -240,7 +244,7 @@ module.exports = {
   modules: { 
     // ...
     moduleType: {
-      resolve: "../custom-module", 
+      resolve: "../custom-module/src", 
       // ...
     },
   },
@@ -255,7 +259,7 @@ module.exports = {
   modules: { 
     // ...
     moduleType: {
-      resolve: "../custom-module/index.ts", 
+      resolve: "../custom-module/src/index.ts", 
       // ...
     },
   },