Delete unused shortcodes

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

layouts/shortcodes/bergamot_preset.html

@@ -1,10 +0,0 @@
-<script>
-    window.addEventListener('load', function() {
-        window.Bergamot.presets['{{ .Get "name" }}'] = {
-            rules: '{{ .Inner }}',
-            inputPrompt: '{{ .Get "prompt" }}',
-            query: '{{ .Get "query" }}',
-            renderPreset: '{{ default "default" (.Get "rendering") }}'
-        };
-    });
-</script>

layouts/shortcodes/bergamot_render_preset.html

@@ -1,3 +0,0 @@
-<script>
-    window.Bergamot.renderPresets['{{ .Get "name" }}'] = '{{ .Inner }}';
-</script>

layouts/shortcodes/katex_component_js.html

@@ -1,34 +0,0 @@
-<script defer src="{{ .Site.Params.katexJsUrl }}" crossorigin="anonymous"></script>
-<script defer>
-class KatexExpressionShim extends HTMLElement {
-    static observedAttributes = ["expression", "katex-options"];
-    targetSpan;
-
-    constructor() {
-        super();
-    }
-
-    doRender() {
-        if (!this.targetSpan) return;
-
-        const options = this.hasAttribute("katex-options") ?
-            this.getAttribute("katex-options") : {};
-        katex.render(
-            this.getAttribute("expression"),
-            this.targetSpan,
-            JSON.parse(options)
-        );
-    }
-
-    connectedCallback() {
-        this.targetSpan = document.createElement('span');
-        this.appendChild(this.targetSpan);
-        this.doRender();
-    }
-
-    attributeChangedCallback(name, oldValue, newValue) {
-        this.doRender();
-    }
-}
-customElements.define("katex-expression", KatexExpressionShim);
-</script>