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

src/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) Known Element Enterprises LLC (as the management company of Turnkey Network Systems LLC)
+  - (Party 2) TSYS Group Component
+
+for the provision of needed support services by Known Element Enterprises LLC for TSYS Group Component 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:
+
+  - TSYS Group Component 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.
+
+- TSYS Group Component may elect to have the forked repository be public/read only as they wish. Known Element Enterprises LLC hereby agrees to that option automatically upon TSYS Group Component election to do so.
+
+- This contract is governed solely and entirely by the laws of the State of Texas, without regard to its conflict-of-laws rules.
+
+- TSYS Group Component hereby certifies it has conducted extensive due diligence on Known Element Enterprises LLC and its officers, including any public material and private material that may have been provided by the officers of Known Element Enterprises LLC, 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.