* Start to update the theme
- Ligther colors
- No more border radius
- Buttons are now always colored
- Start to redesign the post page (according to the Figma mockups)
* Fix build script: it now recompiles everytime a scss file changed
* Make sure the article illustrations are not too big
* Make articles wider (70 characters)
* Better contrast between gray shades
* Various improvements
* Better mobile style
* New style for the footer
* Improve comment style
* Better responsiveness again
* Limit the size of the article cover
* Last details?
- Improve buttons on the media page
- Improve lists
* Pin the stdweb version that we use
It changed because I removed Cargo.lock to handle a merge conflict
I could have updated cargo web too, but it mean I should have re-built
the CI docker image and it was taking forever.
* Better contrast for links in the header of the article
* Add a basic privacy policy
* Remove "also"
* Fix a few issues
- Don't watch static/css in build.rs
- Another shade of white
- Remove useless margin rule for error messages
With this PR, when JS is activated and WASM supported, the article editor will be dynamically replaced with `contenteditable`s elements. This makes the editing interface simpler and less like a regular form. It will also allow us to easily add visual formatting with native browser APIs (and to insert images or videos directly). Here is a little demo:

There is still a lot to do, but it is a good first step.
Fixes#255
Rust can compile to WASM, so let's use it for front-end code as well.
To compile the front-end:
```
cargo install cargo-web
cargo web deploy -p plume-front
```
All the template are now compiled at compile-time with the `ructe` crate.
I preferred to use it instead of askama because it allows more complex Rust expressions, where askama only supports a small subset of expressions and doesn't allow them everywhere (for instance, `{{ macro!() | filter }}` would result in a parsing error).
The diff is quite huge, but there is normally no changes in functionality.
Fixes#161 and unblocks #110 and #273