Fix and update template_missing image in guide

This commit updates the Missing Template image in the Getting Started
Guide.

The new image displays the current error message. Additionally:
- New image is a PNG file, whereas the current image is in fact a misnamed JPEG.
- New image is smaller.

Before:

```
$ file --mime -b template_is_missing_articles_new.png
image/jpeg; charset=binary
$ du -h template_is_missing_articles_new.png
464K    template_is_missing_articles_new.png
```

After:

```
$ file --mime -b template_is_missing_articles_new.png
image/png; charset=binary
$ du -h template_is_missing_articles_new.png
28K     template_is_missing_articles_new.png
```

[ci-skip]
This commit is contained in:
utilum 2019-02-04 13:59:06 +01:00
parent 00f7dbab75
commit 3eeb063afd

Binary file not shown.

Before

Width:  |  Height:  |  Size: 461 KiB

After

Width:  |  Height:  |  Size: 26 KiB