microsite: install docs

docs/features/software-catalog/installation.md

@@ -1,4 +1,7 @@
-# Installing in your Backstage App
+---
+id: installation
+title: Installing in your Backstage App
+---
 
 The catalog plugin comes in two packages, `@backstage/plugin-catalog` and
 `@backstage/plugin-catalog-backend`. Each has their own installation steps,

docs/features/software-templates/installation.md

@@ -1,4 +1,7 @@
-# Installing in your Backstage App
+---
+id: installation
+title: Installing in your Backstage App
+---
 
 The scaffolder plugin comes in two packages, `@backstage/plugin-scaffolder` and
 `@backstage/plugin-scaffolder-backend`. Each has their own installation steps,

microsite/sidebars.json

@@ -37,6 +37,7 @@
         "label": "Software Catalog",
         "ids": [
           "features/software-catalog/software-catalog-overview",
+          "features/software-catalog/installation",
           "features/software-catalog/system-model",
           "features/software-catalog/descriptor-format",
           "features/software-catalog/extending-the-model",
@@ -49,6 +50,7 @@
         "label": "Software Templates",
         "ids": [
           "features/software-templates/software-templates-index",
+          "features/software-templates/installation",
           "features/software-templates/adding-templates",
           "features/software-templates/extending/extending-index",
           "features/software-templates/extending/extending-templater",