Fix microsite and add changelog

Changelog.md

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+# Changelog
+
+## v0.3.0
+
+- Support for many more document types has been added (including
+  images and office documents). All input files are converted into PDF
+  files (the original file is preserved).
+- PDF Text extraction improved by omitting OCR if text can be
+  stripped.
+- There is a new PDF viewer (utilizing viewerjs) that also works in
+  mobile browsers.
+- Improve editing notes: Since notes may evolve, there is now a larger
+  edit form and a markdown preview.
+- Show the extracted information (text, labels, proposals) of an
+  attachment in the Webui.
+- The name search now also searches in item notes.
+- Bug fixed where it was possible to create invalid input when
+  creating new sources.
+- Bug fixed where the item menu was not properly initialized for
+  equipments.
+- The `ds.sh` script has now an option to check a file for existence
+  in docspell.
+
+### Configuration Changes
+
+The configuration of the joex component has been changed. 
+
+- removed `docspell.joex.extraction.allowed-content-types`
+- other settings in `docspell.joex.extraction` have been moved to
+  `docspell.joex.extraction.ocr`
+- added `docspell.joex.extraction.ocr.max-image-size`
+- added `docspell.joex.extraction.pdf.min-text-len`
+- added sections in `docspell.joex.convert` for pdf conversion
+  settings
+  
+### REST Api Changes
+
+The REST Api has some additions:
+
+- new route to retrieve the original file
+- new route to get the rendered pdf of an attachment (using viewerjs)
+- add field in `ItemDetail` data that refers to the original files of
+  the attachments
+  
+
+## v0.2.0
+
+*Jan. 12, 2020*
+
+The second release of Docspell addresses some annoying issues in the
+UI and adds a "send by email" feature.
+
+- Send an item and its attachments via E-Mail (requires to setup SMTP
+  settings per user)
+- Add a search field for meta data
+- The item detail view is now a perma-link
+- New endpoints to check whether a file is in Docspell by using their
+  SHA-256 checksum (see the api doc here and here), the scripts in
+  tools/ now use this endpoint to skip existing files
+- Better support multiple attachments with long names in the UI
+- Fixes textarea updating issues
+
+## v0.1.0
+
+*Sep. 21, 2019*
+
+The initial release of Docspell containing the basic features with a
+Web UI:
+
+- Create items by uploading PDF files
+- Analyze the PDF files and propose meta data
+- Manage meta data and items
+- View processing queue