v0.1: replace shell-rendered site with Grav-native pages + theme

- Drop site/ + RenderSite.sh: repo now carries grav/user/pages as
  native Grav markdown pages (home/services/terms/sign/execution)
- Add knel-contract theme: inherits quark2 via stream fallback, adds
  sign.html.twig (Twig) driving the DocuSeal flow through the APISIX
  gateway; esign wiring lives in the theme yaml for forks to retarget
- CreateDocument.sh refreshes the Grav services page from the
  rendered catalogs instead of invoking the removed site renderer

Ticket: https://projects.knownelement.com/issues/924

contract-inputs/sign-electronic.md

@@ -1,55 +0,0 @@
----
-title: 'Sign Electronically'
-visible: true
----
-
-## Sign this contract electronically
-
-This contract can be executed electronically via the KNEL DocuSeal e-signature platform, reached through the KNEL APISIX API gateway. Enter the signer's details below; DocuSeal will email a signing link.
-
-<form id="esign-form" onsubmit="return esignSubmit(event)">
-  <label for="esign-name">Full name</label>
-  <input type="text" id="esign-name" name="name" required style="display:block;margin-bottom:8px;min-width:280px;padding:6px;">
-  <label for="esign-email">Email address</label>
-  <input type="email" id="esign-email" name="email" required style="display:block;margin-bottom:12px;min-width:280px;padding:6px;">
-  <label for="esign-entity">Entity (Party 2)</label>
-  <input type="text" id="esign-entity" name="entity" required style="display:block;margin-bottom:12px;min-width:280px;padding:6px;">
-  <button type="submit" style="padding:8px 16px;">Request signature link</button>
-</form>
-
-<p id="esign-status" style="margin-top:12px;"></p>
-
-<script>
-function esignSubmit(ev) {
-  ev.preventDefault();
-  var status = document.getElementById('esign-status');
-  status.textContent = 'Requesting signing link…';
-  var name = document.getElementById('esign-name').value;
-  var email = document.getElementById('esign-email').value;
-  var entity = document.getElementById('esign-entity').value;
-  fetch('{{ESIGN_API_URL}}', {
-    method: 'POST',
-    headers: {'Content-Type': 'application/json'},
-    body: JSON.stringify({
-      template_id: Number('{{ESIGN_TEMPLATE_ID}}'),
-      submitters: [
-        {email: email, name: name, role: 'First Party'},
-        {email: email, name: name + ' (' + entity + ')', role: 'Second Party', is_invited: false}
-      ]
-    })
-  }).then(function (r) {
-    if (!r.ok) throw new Error('gateway returned ' + r.status);
-    return r.json();
-  }).then(function (data) {
-    var slug = data.submitters && data.submitters[0] && data.submitters[0].slug;
-    if (slug) {
-      window.location.href = 'https://esign.knownelement.com/s/' + slug;
-    } else {
-      status.textContent = 'Signing request created. Check ' + email + ' for the signing link.';
-    }
-  }).catch(function (e) {
-    status.textContent = 'Could not create the signing request (' + e.message + '). Contact KNEL helpdesk.';
-  });
-  return false;
-}
-</script>