feat(brand): rename the display name to herald

Sets the name in the README, the documentation site and the Decky menu, and
adds the wordmark: the name in inscriptional Roman capitals, the register coats
of arms and mottoes are cut in, so the typeface carries the same idea the name
does. The glyphs ship as outlines, not as text, so nothing has to have the font
installed. Two inks are selected through a picture element, because one colour
cannot sit on both GitHub themes.

Decky keys a plugin's settings and data directories off the package name, not
off plugin.json's name field -- verified against the shipped artefact, whose
top-level folder is decky-romm-sync while its plugin.json said "RomM Sync".
Changing the display name is therefore free: existing installs keep their
settings, their database and their shortcut ownership records. Renaming the
package is a separate move that needs a migration first, tracked in #1547 and
#1548.

The README says so too, so the announcement reads as information rather than a
reason to worry.

Author: danielcopper

.markdownlint.json

@@ -10,6 +10,7 @@
       "code",
       "details",
       "div",
+      "h3",
       "img",
       "p",
       "picture",

README.md

@@ -1,10 +1,11 @@
 <div align="center">
 
-<img src="assets/logo.png" alt="" width="200">
+<picture>
+  <source media="(prefers-color-scheme: dark)" srcset="assets/lockup-dark.png">
+  <img src="assets/lockup.png" alt="herald" width="300">
+</picture>
 
-# decky-romm-sync
-
-## Your self-hosted RomM library, in your Steam library
+<h3>Your self-hosted RomM library, in your Steam library</h3>
 
 [Getting Started](https://danielcopper.github.io/decky-romm-sync/user-guide/getting-started/) ·
 [Configuration](https://danielcopper.github.io/decky-romm-sync/user-guide/configuration/) ·
@@ -20,10 +21,16 @@
 <a href="https://github.com/danielcopper/decky-romm-sync/stargazers"><img alt="Stars" src="https://img.shields.io/github/stars/danielcopper/decky-romm-sync?style=for-the-badge&color=4795c9&labelColor=16202c"></a>
 <a href="https://github.com/danielcopper/decky-romm-sync/releases"><img alt="Downloads" src="https://img.shields.io/github/downloads/danielcopper/decky-romm-sync/total?style=for-the-badge&color=4795c9&labelColor=16202c"></a>
 <a href="https://github.com/rommapp/romm/releases"><img alt="Requires RomM 4.9.0 or newer" src="https://img.shields.io/badge/RomM-%E2%89%A5%204.9.0-4795c9?style=for-the-badge&labelColor=16202c"></a>
-<a href="https://github.com/danielcopper/decky-romm-sync/blob/main/LICENSE"><img alt="License" src="https://img.shields.io/badge/license-GPL--3.0-4795c9?style=for-the-badge&labelColor=16202c"></a>
+
+<sub>formerly <code>decky-romm-sync</code></sub>
 
 </div>
 
+> [!NOTE]
+> **This project is being renamed to `herald`.** The repository and documentation links move with it; GitHub redirects
+> the old repository URLs automatically. The plugin's own package name is unchanged for now, so updating keeps your
+> settings, your synced library and your saves exactly where they are.
+
 A [Decky Loader](https://decky.xyz/) plugin that syncs your self-hosted [RomM](https://github.com/rommapp/romm) library
 into Steam as non-steam shortcuts. Games appear directly in your Steam library, launch through
 [RetroDECK](https://retrodeck.net/), and can keep their saves in sync across devices through your RomM server.
@@ -78,7 +85,7 @@ into Steam as non-steam shortcuts. Games appear directly in your Steam library,
 > **v1.0** release. Until then, use the manual install below.
 
 Once published, install it straight from Decky's built-in store — open the Quick Access Menu → **Decky** → store icon,
-search for **RomM Sync**, and install. No Developer Mode required.
+search for **herald**, and install. No Developer Mode required.
 
 </details>
 
@@ -100,7 +107,7 @@ gear icon → toggle **Developer Mode**).
 
 ## Quick start
 
-1. Open the Quick Access Menu and select **RomM Sync**
+1. Open the Quick Access Menu and select **herald**
 2. In **Settings**, enter your RomM server URL and credentials, then hit **Test Connection**
 3. In **Platforms**, enable the platforms you want to sync
 4. Hit **Sync Library** — your ROMs appear as non-steam shortcuts