feat(web): rewrite web client implementation

The goal of this rewrite is to make the code more composable to make it
easier to add new functionality in the future.

Here's a list of the most relevant changes:

* Use a declarative component-based UI with a virtual DOM to separate
  rendering logic from the business logic.

* Add a router to support deep-linking to specific tasks.

* Reduce Wasm binary from ~2 MB to ~450 kB (uncompressed).

* Add local session caching to reduce the number of network requests.

* Remove atomic-based CSS classes in favor of semantic classes.

* Rename all occurrences of "task" with "job" and "pipeline" with
  "task" (this change will be applied to the other crates as well).

* Minor visual changes.

This commit (partially) resolves the following issues:

* #14
* #15
* #18
* #27

.dockerignore

@@ -3,9 +3,9 @@
 /src/core/
 /src/processors/
 /src/server/
+/src/web-client/target/
 /target/debug/
 /target/release/
-/target/wasm32-unknown-unknown/
 /target/x86_64-unknown-linux-musl/debug/
 /target/x86_64-unknown-linux-musl/release/.fingerprint/
 /target/x86_64-unknown-linux-musl/release/build/

.gitignore

@@ -1,3 +1,5 @@
 /src/web-client/static/app
+/src/web-client/static/css/style.css
+/src/web-client/target
 /target
 /tmp