Muhammad/exasol perosnal

[abdullah094]

Mentioned Exasol Personal in 3 locations

1. doc/getting_started.rst — the main update. The intro now lists four ways to get started with Exasol Personal first, and the walkthrough now uses Exasol Personal instead of SaaS: the "Setting up the db" section explains what it is, shows the launcher install command (curl https://downloads.exasol.com/exasol-personal/installer.sh | sh) and the five exasol install presets, and links to the GitHub repo and Quick Start Guide. The SaaS path is kept as the "managed database" alternative, and the pyexasol connection section now notes that exasol info gives you the connection details (the existing sys/exasol example happens to match Personal's local defaults).
2. doc/gen_ai/ai_text_summary/index.rst — added a note in "Step 1: Start Exasol Database" offering Exasol Personal as an alternative to Docker; it fits this tutorial especially well since its pitch is the same ("your data never leaves your infrastructure").
3. doc/examples/sales_forecasting/setup.rst — added Exasol Personal as a database option for the AI-Lab demo, connected via AI-Lab's On-Prem option.