Added back changelog and upgrade instructions

docs/reference/meta-tags.md

@@ -0,0 +1,34 @@
+---
+template: overrides/main.html
+---
+
+# Meta tags
+
+TBD
+
+<!-- Material for MkDocs supports several flavors of lists that cater to different
+use cases, including _unordered lists_ and _ordered lists_, which are supported
+through standard Markdown, as well as _definition lists_ and _task lists_, which
+are supported through extensions. -->
+
+## Configuration
+
+### Metadata
+
+[:octicons-file-code-24: Source][1] · [:octicons-workflow-24: Extension][2]
+
+The [Metadata][1] extension, which is part of the standard Markdown
+library, adds the ability to add custom metadata to a document and can be 
+enabled from `mkdocs.yml`:
+
+``` yaml
+markdown_extensions:
+  - meta
+```
+
+  [1]: https://github.com/squidfunk/mkdocs-material/blob/master/src/base.html
+  [2]: https://python-markdown.github.io/extensions/meta_data/
+
+## Customization
+
+- add custom meta tags, like twitter cards etc via customization!?