updated news.md and readme.md for 1.8.0 release

[samskalicky]

Description

updated news.md and readme.md for 1.8.0 release

[mxnet-bot]

Hey @samskalicky , Thanks for submitting the PR
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[ciyongch]

It's great to see 1.8.0 release, kudos to @samskalicky !
The original template of the news for major/minor release is kind of trivial :-P.
Is this the new format for the upcoming release as all the changes items are in a single bullet, is it better to keep at least new features (like intgemm/cudagraph) and feature improvements? Which will be easier to get the newly introduced features.

[samskalicky]

It's great to see 1.8.0 release, kudos to @samskalicky !
The original template of the news for major/minor release is kind of trivial :-P.
Is this the new format for the upcoming release as all the changes items are in a single bullet, is it better to keep at least new features (like intgemm/cudagraph) and feature improvements? Which will be easier to get the newly introduced features.

Honestly, I dont think we need this News.md updated as we have been doing. Its pretty much a duplication of whats in the release notes: https://github.com/apache/incubator-mxnet/releases and in the Readme.md we actually link to that page. The News.md isnt used anywhere anymore, users actually have to go click it to view it. it doesnt show up on the main GitHub page or the website anymore.

[ciyongch]

duplicated PR number?

[ciyongch]

LGTM