v0.1: contract legal overhaul + Grav site + e-sign integration

- Real dispute-resolution/governing-law/venue section replaces the
  unenforceable 'auto resolved in our favor' clause; jury waiver
  rewritten with carve-outs
- New sections: definitions, liability cap, confidentiality, IP,
  force majeure, assignment, notices, termination/renewal, e-sign
- SLA/SLO semantics fixed (SLA=contractual min, SLO=non-binding
  target); payment currency/invoicing terms added
- Introduction now mustache-templated ({{PARTY2}} bug fixed)
- SUMMARY.md structure fixed (case mismatch, empty heading, dupes)
- RenderBook.sh build-only; new RenderSite.sh renders Grav pages
  (site/) incl. DocuSeal e-sign page via APISIX

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

contract-inputs/introduction.md

@@ -0,0 +1,32 @@
+## Introduction
+
+- This contract is a public document showing the full terms and conditions of a proposed contract between:
+  - (Party 1) {{PARTY1}} (as the management company of Turnkey Network Systems LLC)
+  - (Party 2) {{PARTY2}}
+
+for the provision of needed support services by {{PARTY1}} for {{PARTY2}} to conduct its front/middle/back office IT/business operations functions as a TSYS Group component.
+
+- This contract is licensed under the AGPL v3.0 only, with a small amount of proprietary scoped components (listed below). This repository is meant to be forked to a private, proprietary / confidential repository for execution with the only permitted proprietary alterations being:
+
+  - {{PARTY2}} officer name/contact details
+  - Entity in scope
+  - Execution date
+  - Payment terms
+  - Length of contract term
+  - Renewal / extension options
+
+- If any other modifications to this contract are needed (other than those listed above), they must be done in this repository and placed under AGPL v3.0 only.
+
+- {{PARTY2}} may elect to have the forked repository be public/read only as they wish. {{PARTY1}} hereby agrees to that option automatically upon {{PARTY2}} election to do so.
+
+- This contract is governed solely and entirely by the laws of the State of {{GOVERNING_STATE}}, without regard to its conflict-of-laws rules.
+
+- {{PARTY2}} hereby certifies it has conducted extensive due diligence on {{PARTY1}} and its officers, including any public material and private material that may have been provided by the officers of {{PARTY1}}, and is entering into this agreement having fully read and understood it.
+
+This contract documents the:
+
+- Applications
+- Systems
+- Services
+
+offered to all TSYS Group components.