Add key bindings for inserting new blocks at the end/top of the buffer, as well as before the current block (#85)

* Add functionality to insert new block after the last block

- Update key bindings in `initial-content.ts` to include `Alt + Enter` for adding a new block after the last block.
- Implement `getLastNoteBlock` function in `block.js` to retrieve the last block in the note.
- Add `addNewBlockAfterLast` command in `commands.js` to handle the insertion of a new block after the last one.
- Integrate `addNewBlockAfterLast` command into the keymap in `keymap.js`.

* Add block insertion before/after current, before first and after last. Also, tests.

- Added `getFirstNoteBlock` in `block.js` for accessing the first text block.
- Implemented new functions in `commands.js` like `addNewBlockBeforeCurrent` and `addNewBlockBeforeFirst`.
- Updated `keymap.js` with new key bindings to facilitate block creation.
- Introduced `block-creation.spec.js` for testing the new block manipulation features.

* Fix visual bug when inserting new block at the top

* Update help text and Readme

* Fix wrong cursor position after inserting new blocks at the top of the buffer, when the previous first block's delimiter is long (e.g. Markdown)

* Make RegEx more generic

* Fix import

* Auto-generate the README.md and initial-content documentation

- Add a documentation generator
- Add an option to force the initial content to be erased with an env variable

* Add more specific tests

* Fix Mod key on Mac in test

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Co-authored-by: Jonatan Heyman <jonatan@heyman.info>

electron/detect-platform.ts

@@ -1,4 +1,4 @@
-const os = require('os');
+import os from 'os';
 
 export const isDev = !!process.env.VITE_DEV_SERVER_URL