feat(docs): outline core articles

Author: Char2sGu

docs/src/app/content/core/exception/index.md

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+# {{ NgDocPage.title }}
+
+Some content goes here.

docs/src/app/content/core/exception/ng-doc.page.ts

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+import { NgDocPage } from '@ng-doc/core';
+
+import CoreCategory from '../ng-doc.category';
+
+const TypeSafeProvidingPage: NgDocPage = {
+  category: CoreCategory,
+  title: `Exceptions`,
+  mdFile: './index.md',
+};
+
+export default TypeSafeProvidingPage;

docs/src/app/content/core/ng-doc.category.ts

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+import { NgDocCategory } from '@ng-doc/core';
+
+const CoreCategory: NgDocCategory = {
+  title: 'Core',
+};
+
+export default CoreCategory;

docs/src/app/content/core/overview/index.md

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+# {{ NgDocPage.title }}
+
+Some content goes here.

docs/src/app/content/core/overview/ng-doc.page.ts

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+import { NgDocPage } from '@ng-doc/core';
+
+import CoreCategory from '../ng-doc.category';
+
+const TypeSafeProvidingPage: NgDocPage = {
+  category: CoreCategory,
+  title: `Overview`,
+  mdFile: './index.md',
+  order: 1,
+};
+
+export default TypeSafeProvidingPage;

docs/src/app/content/core/type-container/index.md

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+# {{ NgDocPage.title }}
+
+Some content goes here.

docs/src/app/content/core/type-container/ng-doc.page.ts

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+import { NgDocPage } from '@ng-doc/core';
+
+import CoreCategory from '../ng-doc.category';
+
+const TypeSafeProvidingPage: NgDocPage = {
+  category: CoreCategory,
+  title: `Type Container`,
+  mdFile: './index.md',
+};
+
+export default TypeSafeProvidingPage;

docs/src/app/content/core/type-safe-providing/index.md

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+# {{ NgDocPage.title }}
+
+Some content goes here.

docs/src/app/content/core/type-safe-providing/ng-doc.page.ts

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+import { NgDocPage } from '@ng-doc/core';
+
+import CoreCategory from '../ng-doc.category';
+
+const TypeSafeProvidingPage: NgDocPage = {
+  category: CoreCategory,
+  title: `Type-safe Providing`,
+  mdFile: './index.md',
+};
+
+export default TypeSafeProvidingPage;