docs(component): add warning about maintenance mode (#4873)

Closes #4872

Author: markostanimirovic

projects/ngrx.io/content/guide/component/index.md

@@ -1,3 +1,10 @@
+<div class="alert is-critical">
+
+The `@ngrx/component` package is in <a href="https://github.com/ngrx/platform/issues/4872" target="_blank">maintenance mode</a>.
+Changes to this package are limited to critical bug fixes.
+
+</div>
+
 # @ngrx/component
 
 Component is a library for building reactive Angular templates.

projects/ngrx.io/content/guide/component/install.md

@@ -1,3 +1,10 @@
+<div class="alert is-critical">
+
+The `@ngrx/component` package is in <a href="https://github.com/ngrx/platform/issues/4872" target="_blank">maintenance mode</a>.
+Changes to this package are limited to critical bug fixes.
+
+</div>
+
 # Installation
 
 ## Installing with `ng add`

projects/ngrx.io/content/guide/component/let.md

@@ -1,3 +1,10 @@
+<div class="alert is-critical">
+
+The `@ngrx/component` package is in <a href="https://github.com/ngrx/platform/issues/4872" target="_blank">maintenance mode</a>.
+Changes to this package are limited to critical bug fixes.
+
+</div>
+
 # Let Directive
 
 The `*ngrxLet` directive serves a convenient way of binding observables to a view context

projects/ngrx.io/content/guide/component/push.md

@@ -1,3 +1,10 @@
+<div class="alert is-critical">
+
+The `@ngrx/component` package is in <a href="https://github.com/ngrx/platform/issues/4872" target="_blank">maintenance mode</a>.
+Changes to this package are limited to critical bug fixes.
+
+</div>
+
 # Push Pipe
 
 The `ngrxPush` pipe serves as a drop-in replacement for the `async` pipe.