chore: remove unused schematics readme (#13604)

* Since we already track all available schematics in the schematics guide, we should remove the outdated `README.md` for the Angular Material schematics.
* Also while being at it, we should remove the readme for the CDK schematics as well because there is no useful information stored within that readme (the source is self-explaining; and documented mostly)

src/cdk/schematics/BUILD.bazel

@@ -10,7 +10,7 @@ exports_files(["#bazel_workaround.txt"])
 
 filegroup(
   name = "schematics_assets",
-  srcs = glob(["**/files/**/*", "**/*.json"]) + ["README.md"],
+  srcs = glob(["**/files/**/*", "**/*.json"]),
 )
 
 ts_library(

src/cdk/schematics/README.md

@@ -1 +0,0 @@
-## Cdk schematics

src/lib/schematics/BUILD.bazel

@@ -7,7 +7,7 @@ load("//tools:defaults.bzl", "jasmine_node_test")
 
 filegroup(
   name = "schematics_assets",
-  srcs = glob(["**/files/**/*", "**/*.json"]) + ["README.md"],
+  srcs = glob(["**/files/**/*", "**/*.json"]),
 )
 
 ts_library(

src/lib/schematics/README.md

@@ -1,30 +0,0 @@
-# Angular Material Schematics
-A collection of Schematics for Angular Material.
-
-## Collection
-
-### Install
-Adds Angular Material and its depedencies and pre-configures the application. 
-
-- Adds Material and CDK to `package.json`
-- Adds Material Icons Stylesheet to `index.html`
-- Adds Roboto Font to `index.html`
-- Ensure `BrowserAnimationsModule` is installed and included in root module
-- Adds pre-configured theme to `.angular.json` file OR adds custom theme scaffolding to `styles.scss`
-
-Command: `ng add @angular/material`
- 
-### Dashboard
-Creates a responive card grid list component.
-
-Command: `ng g @angular/material:dashboard my-dashboard`
-
-### Nav
-Creates a navigation component with a responsive sidenav.
-
-Command: `ng g @angular/material:nav my-nav`
-
-### Table
-Creates a table component with sorting and paginator.
-
-Command: `ng g @angular/material:table my-table`