docs: add v0.13 release notes

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Commits
Files that changed from the base of the PR and between a49d430dd4d69e002a97baa0889fd083f3bc3630 and 17595256a3bb757971ca95974c7416648002d4f7.

Walkthrough

Version 0.12.0 addressed minor formatting issues, adding the openai item to a list and fixing a missing newline. Version 0.13.0 introduced significant new features, including a Home page with the Answer Engine, improved context indexing, web page crawling support, git tree navigation, enhanced logging, checksum verification, and new admin UI capabilities.

Changes

Files	Change Summary
.changes/v0.12.0.md	Added `openai` item, corrected missing newline.
.changes/v0.13.0.md	Introduced Home page with Answer Engine, enhanced context indexing, web page crawling, git tree navigation, sha256 checksum verification, environment variable for host override, version bump for llama.cpp, improved logging, background job triggering in admin UI.

Poem

In the code's vast and endless sea,
New features bloom like spring's decree.
Home page bright with answers clear,
Crawling webs, no bug to fear.
Logs enhanced, a journey's mark,
Checksum safe, no hacker’s spark.
In this realm, our work refines,
A rabbit’s touch in every line. 🐇✨

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TabbyML / tabby