docs: Update and improve README

Signed-off-by: Minecon724 <git@m724.eu>

README.md

@@ -3,13 +3,13 @@ blog-software(config, template, content) = blog website
 ## Usage
 
 1. [Download the program from here](/Minecon724/blog-software-java/releases)
-2. Get a working directory. See [Project format](#Project format) below.
-   Don't forget to `git init`!
-3. Run the program:
+2. Run the program:
    ```shell
-    java -jar blog-0.0.1-shaded.jar
+    java -jar blog-0.0.1-shaded.jar -s example_workdir
     ```
    
+For tips on how to create your own project (workdir), see [Project format](#Project format) below.
+   
 ## Important caveats
 Generated site must be the root of a subdomain, like `https://example.com/`. \
 You can't put it in a directory, like `https://example.com/blog/`
@@ -25,12 +25,19 @@ There's an ["Example workdir"](/Minecon724/blog-software-java/src/branch/master/
 
 Basically:
 - `assets/` - contains static assets
-- `posts/` - contains posts
+- `posts/` - contains posts. Post format:
+  - Header / metadata:
+    - `title A title` - post title
+    - `summary This is a post with a title` - post summary
+    - `live` - is the post live (not draft), doesn't need an argument
+    - Custom properties, which are Strings
+  - ` ` - Empty line separates header from content
+  - Post content in HTML. Generally not sanitized, but depends on template.
 - `template/` - contains the template, see [Template format](#Template format) below
-- `site-config.json` - the site configuration
-  - `name: "my blog"` property - site name
-  - `baseUrl: "https://example.com"` property - URL of the site. It must be a root URL - folders are currently not supported. This is used only for the RSS feed.
-  - custom properties
+- `site-config.yml` - the site configuration
+  - `name: my blog` property - site name
+  - `baseUrl: https://example.com` property - URL of the site. It must be a root URL - folders are currently not supported. This is used only for the RSS feed.
+  - Custom properties, which can be anything as they are Objects
 
 ## Template format
 https://pebbletemplates.io is used