Theming (#624)

* Theming

- Custom CSS for blogs
- Custom themes for instance
- New dark theme
- UI to choose your instance theme
- Option to disable blog themes if you prefer to only have the instance theme
- UI to choose a blog theme

assets/icons/trwnh/README.md

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+# plumeLogos
+Logos designed for Plume, a federated blogging platform similar to Medium. Licensed under CC0.
+
+# 1st place design - "Feather"
+Path | Filled | Silhouette
+--- | --- | ---
+![plumeFeather](https://raw.githubusercontent.com/trwnh/plumeLogos/master/plumeFeather/plumeFeather512.png) | ![plumeFeatherFilled](https://raw.githubusercontent.com/trwnh/plumeLogos/master/plumeFeatherFilled/plumeFeatherFilled512.png) | ![plumeFeatherBlack](https://raw.githubusercontent.com/trwnh/plumeLogos/master/plumeFeatherBlack/plumeFeatherBlack512.png)
+
+# 2nd place design - "Paragraphs"
+Filled | Silhouette
+--- | ---
+![plumeParagraphs](https://raw.githubusercontent.com/trwnh/plumeLogos/master/plumeParagraphs/plumeParagraphs512.png) | ![plumeParagraphsBlack](https://raw.githubusercontent.com/trwnh/plumeLogos/master/plumeParagraphsBlack/plumeParagraphsBlack512.png)
+
+# Links
+You may find me at the following locations:
+- Website: http://trwnh.com
+- ActivityPub: https://mastodon.social/@trwnh
+
+If you'd like to support me, you can do so:
+- One-time: https://paypal.me/trwnh
+- Recurring: https://liberapay.com/trwnh