Setup -> Installation + title updates

Updates the docs to reflect that it's not a "setup" documention but
rather an installation document.

I've also updated the header of architecture.md to reflect the filename.

README.md

@@ -26,14 +26,14 @@ Other examples are provided in the _examples_ [directory](./examples).
 
 We have multiple ways to install Kompose. Our prefered method is downloading the binary from the latest GitHub release.
 
-Our entire list of installation methods are located in our [setup.md](/docs/setup.md) document.
+Our entire list of installation methods are located in our [installation.md](/docs/installation.md) document.
 
 Installation methods:
   - [Binary (Prefered method)](README.md)
-  - [Go](/docs/setup.md#go)
-  - [CentOS](/docs/setup.md#centos)
-  - [Fedora](/docs/setup.md#fedora)
-  - [macOS (Homebrew)](/docs/setup.md#macos)
+  - [Go](/docs/installation.md#go)
+  - [CentOS](/docs/installation.md#centos)
+  - [Fedora](/docs/installation.md#fedora)
+  - [macOS (Homebrew)](/docs/installation.md#macos)
 
 #### Binary installation
 
@@ -106,7 +106,7 @@ Documentation can be found at our [kompose.io](http://kompose.io) website or our
 Here is a list of all available docs:
 
 - [Quick start](docs/quickstart.md)
-- [Setup](docs/setup.md)
+- [Installation](docs/installation.md)
 - [User guide](docs/user-guide.md)
 - [Conversion](docs/conversion.md)
 - [Architecture](docs/architecture.md)

docs/architecture.md

@@ -1,4 +1,4 @@
-# Internal Design
+# Architecture and Internal Design
 
 `kompose` has 3 stages: Loader, Transformer and Outputter. Each Stage should have well defined interface so it is easy to write new Loader, Transformer or Outputters and plug it in. Currently only Loader and Transformer interfaces are defined.