Add blog post for 1.5.0

[techknowlogick]

Date will need to be changed to the correct release date.

[sondr3]

Are you gonna expand on the features in this release akin to the blog post for 1.4? It was a big plus in my book to delve a bit deeper into the new and big features that came with that release instead of just listing the changelog and a small paragraph about this release.

[lunny]

I would like you include a public gpg key here for verify the downloads. I have uploaded that on #maintainers channel.

[techknowlogick]

@lunny Good Idea. I think we should put that on gitea.io website and link to it from this blog post. I've added a line about GPG updates.

@sondr3 good idea. I've just added some text to the blog post which expands on changes.

[lafriks]

It would be nice to add notice that we will be dropping integrated TiDB support in next release

[techknowlogick]

@lafriks that is in the blog post

[lafriks]

Oh, sorry you are right, missed that :)

[lafriks]

@thehowl could you add more detailed info with screenshots etc about new features?

[thehowl]

Hey - I'm quite overwhelmed with work as of lately and I kind of lost interest in Gitea (I should get around to ask to be moved to advisors :P) but I guess I can try to make time to sum up the changes and make a changelog like the previous one. I'll try to do it over the weekend.

[lunny]

@thehowl do you have time to do that?

[thehowl]

I'll get to it now

[techknowlogick]

@thehowl I gave you push access to my repo. Feel free to make changes directly to this PR.

[techknowlogick]

Closing as #72 exists now.