New tag descriptions

hugo/content/tags/angular/_index.md

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+---
+title: Angular
+description: Angular is a framework which helps you build great cross-platform applications.
+link: https://angular.io/
+---

hugo/content/tags/cloud-functions/_index.md

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+---
+title: Cloud functions
+description: Cloud functions is a serverless service that helps you run code by triggers like database events(new data created),auth(new user was created) etc.
+link: https://firebase.google.com/docs/functions/
+---

hugo/content/tags/firestore/_index.md

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+---
+title: Firestore
+description: Firestore is NoSQL cloud database where data is stored in documents that contain fields mapping to values.
+link: https://firebase.google.com/docs/firestore/
+---

hugo/content/tags/node/_index.md

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+---
+title: Node
+description: Node.js is a JavaScript runtime environment that achieves low latency and high throughput. 
+link: https://nodejs.org/en/
+---

hugo/content/tags/rxjs/_index.md

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+---
+title: RxJS
+description: RxJS is javascript library that helps you work better with asynchronous and callback-based code.
+link: https://rxjs-dev.firebaseapp.com/
+---