Add changelog for version 3.0.0

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+## 3.0.0 (2021.07.02)
+### Features
+- The `rd.json` (markdown data) isn't part of the bundle anymore. It will be fetched and therefore can be cached by the browser. ([#50](https://github.com/AOEpeople/aoe_technology_radar/issues/50))
+- Non featured articles will be separated to the bottom of the list in quadrant view. Therefore, you can see what isn't featured anymore. ([#78](https://github.com/AOEpeople/aoe_technology_radar/issues/78))
+- Customize the Tech Radar instead of forking it.
+    - Host the application under a sub path. ([#59](https://github.com/AOEpeople/aoe_technology_radar/issues/59))
+    - Change the name of your tech radar.
+    - Change the logo.
+    - Change the favicon.
+    - Replace the index.html.
+    - Change the fonts. ([#88](https://github.com/AOEpeople/aoe_technology_radar/issues/88))
+    - Change the texts on the help page. ([#86](https://github.com/AOEpeople/aoe_technology_radar/issues/86))
+    - Change the footer footnode. ([#86](https://github.com/AOEpeople/aoe_technology_radar/issues/86))
+    - Change the social links. ([#86](https://github.com/AOEpeople/aoe_technology_radar/issues/86))
+    - Change the legal information link. ([#86](https://github.com/AOEpeople/aoe_technology_radar/issues/86))
+
+### Bug Fixes
+- Fix social links ([#49](https://github.com/AOEpeople/aoe_technology_radar/issues/49))
+
+### Changes
+- Simplified the dependencies, scripts and build process ([#81](https://github.com/AOEpeople/aoe_technology_radar/pull/81))
+    - node-sass is not needed anymore
+
+### Breaking Changes
+- Renamed script `aoe_technology_radar` to `aoe_technology_radar-buildRadar` to make clear that this script builds the radar.
+- Added script `aoe_technology_radar-generateJson` to generate the file `rd.json` based on your radar markdown files.
+- Renamed script `aoe_technology_radar-createStatic` to `aoe_technology_radar-createStaticFiles` to make clear that this script creates static files only.
+
+> For more information about the changes and customizations, please have a look in the ([readme.md](https://github.com/AOEpeople/aoe_technology_radar)).