chore: add topic descriptions for orphaned topics (#10214)

Adds a concise single-paragraph description to 32 topics that only had a title, following the contributing guidelines: aspnet-core (12), datastructures-and-algorithms (7), software-design-architecture (3), react-native (3), flutter (2), and one each for blockchain, devrel, power-bi, react, and spring-boot. Also adds the missing topic title to power-bi/hierarchies.

Author: oscarbol09

roadmaps/aspnet-core/content/bogus@QERTjawqCCCkHfR44Ca0s.md

@@ -1 +1,3 @@
-# Bogus
+# Bogus
+
+Bogus is a simple, C#-friendly fake data generator. It lets you create realistic mock objects, lists, and data sets with a fluent API, making it easy to seed tests and demo applications with believable data.

roadmaps/aspnet-core/content/distributed-lock@T2FsSndxzSuKTFdjoyPi-.md

@@ -1 +1,3 @@
-# Distributed Lock
+# Distributed Lock
+
+A distributed lock coordinates access to a shared resource across multiple processes or services. It prevents concurrent modifications and race conditions by ensuring only one client holds the lock at a time, typically backed by a store such as Redis, ZooKeeper, or a database.

roadmaps/aspnet-core/content/frameworks@1YL7aXluINOO15W3waaiD.md

@@ -1 +1,3 @@
-# Frameworks
+# Frameworks
+
+.NET offers a range of frameworks built on the base runtime, each addressing a specific domain: ASP.NET Core for web applications and APIs, EF Core for data access, and .NET MAUI for cross-platform client apps. Choosing the right framework for the job is one of the first decisions when starting a new .NET project.

roadmaps/aspnet-core/content/gitlab-cicd@8Y73Ae32eo6_ye7dw5QRQ.md

@@ -1 +1,3 @@
-# GitLab CI/CD
+# GitLab CI/CD
+
+GitLab CI/CD is the continuous integration and delivery tooling built into GitLab. Pipelines are defined in a `.gitlab-ci.yml` file, where jobs run on GitLab runners to build, test, and deploy your application automatically on every change.

roadmaps/aspnet-core/content/mapperly@x0OopRTwIvoWgT8qi0CE9.md

@@ -1 +1,3 @@
-# Mapperly
+# Mapperly
+
+Mapperly is a source generator for .NET that maps objects without runtime reflection. It generates the mapping code at compile time, making it fast and keeping mappings in sync with your models — just declare a mapper class and it takes care of the rest.

roadmaps/aspnet-core/content/marten@ipb6proIZKG-_vCOMAiBu.md

@@ -1 +1,3 @@
-# Marten
+# Marten
+
+Marten is a .NET document database library built on PostgreSQL. It turns PostgreSQL into a document store, letting you persist and query .NET objects as JSON documents while still leveraging SQL features such as indexes, transactions, and native Postgres tooling.

roadmaps/aspnet-core/content/net-aspire@HqhqqiA5X00Xl1RnZgrNJ.md

@@ -1 +1,3 @@
-# .NET Aspire
+# .NET Aspire
+
+.NET Aspire is an opinionated stack for building observable, production-ready cloud-native .NET applications. It provides curated packages for common cloud dependencies, service discovery, orchestration for local development, and built-in telemetry to make distributed applications easier to build and debug.

roadmaps/aspnet-core/content/net-aspire@Ohc0xzI6qX4hOFVNfRj1F.md

@@ -1 +1,3 @@
-# .NET Aspire
+# .NET Aspire
+
+.NET Aspire is an opinionated stack for building observable, production-ready cloud-native .NET applications. It provides curated packages for common cloud dependencies, service discovery, orchestration for local development, and built-in telemetry to make distributed applications easier to build and debug.

roadmaps/aspnet-core/content/net-maui@olqSPUU3RoxhQ6exfMzeN.md

@@ -1 +1,3 @@
-# .NET MAUI
+# .NET MAUI
+
+.NET MAUI (Multi-platform App UI) is the cross-platform UI framework for .NET. It lets you build native Android, iOS, macOS, and Windows applications from a single C# and XAML codebase, sharing business logic while still allowing per-platform customizations when needed.

roadmaps/aspnet-core/content/respawn@TCswZHviRiu6SIOwUisu8.md

@@ -1 +1,3 @@
-# Respawn
+# Respawn
+
+Respawn is a small .NET utility for resetting test databases to a clean state. It intelligently deletes data by tracking dependencies between tables, so you can run integration tests quickly without manually managing cleanup between test runs.