Added core features to microsite

Signed-off-by: Shashank Bairy R <shashank.bairy04@gmail.com>

microsite/data/plugins/backstage-kubernetes.yaml

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+---
+title: Backstage Kubernetes
+author: Spotify
+authorUrl: https://github.com/spotify
+category: Core Feature
+description: Monitor all your service's deployments at a glance, even across clusters.
+documentation: https://backstage.io/docs/features/kubernetes/overview
+iconUrl: img/backstage-k8s.svg
+npmPackageName: '@backstage/plugin-kubernetes'

microsite/data/plugins/backstage-service-catalog.yaml

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+---
+title: Backstage Service Catalog
+author: Spotify
+authorUrl: https://github.com/spotify
+category: Core Feature
+description: Manage all your services and software components, all in one place.
+documentation: https://backstage.io/docs/features/software-catalog/software-catalog-overview
+iconUrl: img/backstage-service-catalog.svg
+npmPackageName: '@backstage/plugin-catalog'

microsite/data/plugins/backstage-software-templates.yaml

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+---
+title: Backstage Software Templates
+author: Spotify
+authorUrl: https://github.com/spotify
+category: Core Feature
+description: Create new software components in just a few steps, with your standards built-in (Scaffolder).
+documentation: https://backstage.io/docs/features/software-templates/software-templates-index
+iconUrl: img/backstage-software-templates.svg
+npmPackageName: '@backstage/plugin-scaffolder'

microsite/data/plugins/backstage-techdocs.yaml

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+---
+title: Backstage TechDocs
+author: Spotify
+authorUrl: https://github.com/spotify
+category: Core Feature
+description: A docs-like-code solution to technical documentation. Write your docs right alongside your code.
+documentation: https://backstage.io/docs/features/techdocs/techdocs-overview
+iconUrl: img/backstage-techdocs.svg
+npmPackageName: '@backstage/plugin-techdocs'