chore: update website with caching info and fix stale config path

- Dry-run card: mention summaries are cached, pay the AI only once
- New 'Thrifty by design' card: explains the --dry-run → post cache
  workflow with a joke about token budgets
- New 'WIP? No problem.' card: documents --include-prs
- Fix config path in Get Started step: ~/.autobs.json →
  ~/.config/autobs/config.json

docs: add Website section to copilot-instructions

Documents build/index.html location, tone guidelines, when to update,
feature card conventions, and config path source of truth.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: coolapso

.github/copilot-instructions.md

@@ -137,7 +137,20 @@ All terminal output lives in `cmd/root.go`. Colors use `github.com/fatih/color`
 └─ (not posted)       ← cBox + cMeta
 ```
 
+---
+
+## Website (`build/index.html`)
+
+The project website is a single self-contained HTML file served at `https://autobs.coolapso.sh`.
 
+* **Tone:** casual, funny, "vibe coded" personality — keep it irreverent. Corporate jokes, sarcastic asides, and self-aware humour are on-brand.
+* **Update when:** a new user-facing flag is added, a major feature changes the workflow, or existing content becomes stale (e.g. config path, flag names).
+* **Don't update for:** internal refactors, bug fixes, or changes that don't affect how a user interacts with the tool.
+* **Feature cards** live in the `<!-- FEATURES -->` grid section — add a card for any significant new flag or capability.
+* **How it works** steps reflect the high-level pipeline — only update if the user-visible flow changes.
+* **Config path:** `~/.config/autobs/config.json` (respects `$XDG_CONFIG_HOME`) — keep in sync with `configFilePath()` in `cmd/config_file.go`.
+
+---
 
 * **Formatting:** All Go code must be formatted with `go fmt` before committing.
 * **Linting:** All `golangci-lint` checks must be addressed before committing. Run `golangci-lint run` and resolve any reported issues.

build/index.html

@@ -360,7 +360,17 @@ <h3>One command. That's it.</h3>
     <div class="card">
       <div class="card-icon">🕵️</div>
       <h3>Dry-run mode</h3>
-      <p>Preview the AI-generated corporate speak before it permanently pollutes your Jira tickets.</p>
+      <p>Preview the AI-generated corporate speak before it permanently pollutes your Jira tickets. Summaries are cached — so when you approve, <code>autobs</code> posts without calling the AI again. Pay once. Post once.</p>
+    </div>
+    <div class="card">
+      <div class="card-icon">💸</div>
+      <h3>Thrifty by design</h3>
+      <p>Run <code>--dry-run</code> to review. Run <code>autobs</code> to post from cache. One LLM call per update, ever. Tokens don't grow on trees and neither does your AI budget.</p>
+    </div>
+    <div class="card">
+      <div class="card-icon">🚧</div>
+      <h3>WIP? No problem.</h3>
+      <p>Add <code>--include-prs</code> to pull in commits from your open PRs too — drafts included. Because work-in-progress is still work, and your PM definitely wants to hear about it.</p>
     </div>
     <div class="card">
       <div class="card-icon">🗣️</div>
@@ -430,7 +440,7 @@ <h3>Install</h3>
       <div class="step-num">2</div>
       <div>
         <h3>Configure</h3>
-        <p>Run <code>autobs configure</code> — provide your GitHub token, Jira credentials, and LLM API key. Secrets stay local in <code>~/.autobs.json</code>.</p>
+        <p>Run <code>autobs configure</code> — provide your GitHub token, Jira credentials, and LLM API key. Secrets stay local in <code>~/.config/autobs/config.json</code>.</p>
       </div>
     </div>
     <div class="step">