update vweb readme

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This is pre-alpha software.
Lots of things are broken and not implemented yet in V and vweb.
There's no documentation yet, have a look at https://github.com/vlang/vtalk for an example of a simple vweb app.
`vtalk.v` contains all GET and POST actions.
```
```Go
pub fn (app mut App) index() {
posts := app.find_all_posts()
$vweb.html()
@ -25,7 +29,7 @@ pub fn (app App) post() {
`index.html` is an example of the V template language:
```
```html
@for post in posts
<div class=post>
<a class=topic href="@post.url">@post.title</a>
@ -39,3 +43,9 @@ pub fn (app App) post() {
`$vweb.html()` compiles an HTML template into V during compilation, and embeds the resulting code in current action.
That means that the template automatically has access to that action's entire environemnt.
### Deploying vweb apps
Everything, including HTML templates, is in one binary file. That's all you need to deploy.