docs(dev): document exporting functionality

docs/Developer Guide/!!!meta.json

@@ -1717,6 +1717,33 @@
                             "format": "markdown",
                             "dataFileName": "Hidden notes.md",
                             "attachments": []
+                        },
+                        {
+                            "isClone": false,
+                            "noteId": "vphziLmQeQHY",
+                            "notePath": [
+                                "jdjRLhLV3TtI",
+                                "wbVIolLKDhe2",
+                                "vphziLmQeQHY"
+                            ],
+                            "title": "Share",
+                            "notePosition": 260,
+                            "prefix": null,
+                            "isExpanded": false,
+                            "type": "text",
+                            "mime": "text/html",
+                            "attributes": [
+                                {
+                                    "type": "label",
+                                    "name": "iconClass",
+                                    "value": "bx bx-share-alt",
+                                    "isInheritable": false,
+                                    "position": 10
+                                }
+                            ],
+                            "format": "markdown",
+                            "dataFileName": "Share.md",
+                            "attachments": []
                         }
                     ]
                 },

docs/Developer Guide/Developer Guide/Development and architecture/Share.md

@@ -0,0 +1,30 @@
+# Share
+## Share theme
+
+The share theme represents the layout, styles and scripts behind the Share notes functionality. The current implementation is a heavy adaptation of [trilium.rocks](https://trilium.rocks/) which is a third-party share theme.
+
+*   The theme resides in `packages/share-theme`.
+*   The HTML is defined in `src/templates` using EJS templating.
+*   The `src/scripts` and `src/styles` subdirectories house the rest of the theme.
+
+## Building the share theme
+
+*   In `packages/share-theme`, run `pnpm build` to trigger a build. This will generate `dist` which will then be used by the server.
+*   Alternatively, use `pnpm dev` to watch for changes.
+
+## Integration with the server for the share functionality
+
+The server renders the templates using EJS templating from the share theme and hosts the assets.
+
+*   In dev mode, the templates and assets are served directly from `packages/share-theme/dist`.
+    *   Modifications to the assets (scripts or styles) will reflect without having to restart the server. However the share theme needs to be built first (see previous section).
+    *   Changes to the template will require a restart of the server, since they are cached. Simply press Enter in the console with `pnpm server:start` to quickly trigger a restart.
+*   In production mode, the share theme is automatically built by the server build script and copied to `dist/share-theme`.
+
+The server route handling this functionality is in `src/share/routes.ts`.
+
+## Exporting to static HTML files
+
+This functionality is also handled by the server, but in `src/services/export/zip/share_theme` instead. It works quite similar to the normal sharing functionality, but it uses `BNote` instead of `SNote` (and so on for other entity types), in order to work regardless of whether a note is shared or not.
+
+The same templates are used and rendered by the server, except that they are stored in a file instead of served to web clients.