Use Ructe (#327)

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

templates/instance/list.rs.html

@@ -0,0 +1,32 @@
+@use templates::base;
+@use template_utils::*;
+@use plume_models::instance::Instance;
+
+@(ctx: BaseContext, instance: Instance, instances: Vec<Instance>, page: i32, n_pages: i32)
+
+@:base(ctx, i18n!(ctx.1, "Administration of {0}"; instance.name.clone()).as_str(), {}, {}, {
+    <h1>@i18n!(ctx.1, "Instances")</h1>
+
+    @tabs(&[
+        ("/admin", i18n!(ctx.1, "Configuration"), false),
+        ("/admin/instances", i18n!(ctx.1, "Instances"), true),
+        ("/admin/users", i18n!(ctx.1, "Users"), false),
+    ])
+
+    <div class="list">
+        @for instance in instances {
+            <div class="flex">
+                <p class="grow">
+                    <a href="https://@instance.public_domain">@instance.name</a>
+                    <small>@instance.public_domain</small>
+                </p>
+                @if !instance.local {
+                    <form class="inline" method="post" action="/admin/instances/@instance.id/block">
+                        <input type="submit" value="@i18n!(ctx.1, if instance.blocked { "Unblock" } else { "Block"})">
+                    </form>
+                }
+            </div>
+        }
+    </div>
+    @paginate(ctx.1, page, n_pages)
+})