[DOC] Add placeholder pages for intro (#2834)

* Add placeholder pages for intro

* Apply suggestions from code review

docs/sources/introduction/_index.md

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+---
+title: What is Pyroscope?
+menuTitle: What is Pyroscope?
+description: Learn about Pyrsocope and profiling.
+weight: 10
+draft: true
+keywords:
+  - Pyroscope
+  - Profiling
+---
+
+<!-- This is placeholder page while we get the content written.  -->
+
+# What is Pyroscope?
+
+<!-- The concept title is required. Use a noun-based title that includes the name of the product or feature. For example: Alerting fundamentals.
+
+A concept provides an overview and background information to help users understand a product, interface, or task. Concepts answer the question “what is it?”. Readers learn about features through concepts. Concepts do not include step-by-step procedures or reference material but often link to those materials.
+
+Refer to the [Concept topic documentation](https://grafana.com/docs/writers-toolkit/writing-guide/topic-types/concept/) for guidelines on writing a concept topic.
+-->
+
+Introduce the concept.
+
+<!-- The introduction is required. Add an introduction to the concept to summarize the purpose or main point of the feature. -->
+
+## Sections
+
+<!-- Add sections replacing **Sections** with subtitles for each section. Concept topics or sections explain what and why. They do not explain how. If you are a new user, you might look for concept information to learn about what Grafana is, why it might be useful to you, and what the general workflow is. -->
+
+## Useful links
+
+<!-- Link out to task or reference topics related to the concept. -->

docs/sources/introduction/examples.md

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+---
+title: Profiling examples
+menuTitle: Profiling examples
+description: What can you do with profiling data to resolve real-world problems?
+weight: 100
+draft: true
+keywords:
+  - Pyroscope
+  - Profiling
+---
+
+<!-- This is placeholder page while we get the content written.  -->
+
+# Profiling examples
+
+<!-- The concept title is required. Use a noun-based title that includes the name of the product or feature. For example: Alerting fundamentals.
+
+A concept provides an overview and background information to help users understand a product, interface, or task. Concepts answer the question “what is it?”. Readers learn about features through concepts. Concepts do not include step-by-step procedures or reference material but often link to those materials.
+
+Refer to the [Concept topic documentation](https://grafana.com/docs/writers-toolkit/writing-guide/topic-types/concept/) for guidelines on writing a concept topic.
+-->
+
+Introduce the concept.
+
+<!-- The introduction is required. Add an introduction to the concept to summarize the purpose or main point of the feature. -->
+
+## Sections
+
+<!-- Add sections replacing **Sections** with subtitles for each section. Concept topics or sections explain what and why. They do not explain how. If you are a new user, you might look for concept information to learn about what Grafana is, why it might be useful to you, and what the general workflow is. -->
+
+## Useful links
+
+<!-- Link out to task or reference topics related to the concept. -->

docs/sources/introduction/pyroscope-in-grafana.md

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+---
+title: Pyroscope and profiling in Grafana
+menuTitle: Pyroscope in Grafana
+description: Learn about how you can use profile data in Grafana.
+weight: 200
+draft: true
+keywords:
+  - Pyroscope
+  - Profiling
+  - Grafana
+---
+
+<!-- This is placeholder page while we get the content written.  -->
+
+# Pyroscope and profiling in Grafana
+
+<!-- The concept title is required. Use a noun-based title that includes the name of the product or feature. For example: Alerting fundamentals.
+
+A concept provides an overview and background information to help users understand a product, interface, or task. Concepts answer the question “what is it?”. Readers learn about features through concepts. Concepts do not include step-by-step procedures or reference material but often link to those materials.
+
+Refer to the [Concept topic documentation](https://grafana.com/docs/writers-toolkit/writing-guide/topic-types/concept/) for guidelines on writing a concept topic.
+-->
+
+Introduce the concept.
+
+<!-- The introduction is required. Add an introduction to the concept to summarize the purpose or main point of the feature. -->
+
+## Sections
+
+<!-- Add sections replacing **Sections** with subtitles for each section. Concept topics or sections explain what and why. They do not explain how. If you are a new user, you might look for concept information to learn about what Grafana is, why it might be useful to you, and what the general workflow is. -->
+
+## Useful links
+
+<!-- Link out to task or reference topics related to the concept. -->