Housekeeping on blog

[Hans5958]

Some general housekeeping for the blog. Mainly adding generic header images, just so it doesn't feel empty since there's only text on the first sight (including embeds).

This may feel a little boring or such but I would say it is better than just text. This may also be unpopular, so that's why I made a PR first.

[Samq64]

The main blog page does look better but in the posts themselves I feel like there's a bit too much orange.

[mxmou]

Mainly adding generic header images, just so it doesn't feel empty since there's only text on the first sight (including embeds).

It's still just text, but some text has an orange background - I don't think that's much better. Most posts contain screenshots, so one of those could be used to represent the post on the blog index.