notebooks update

.github/ISSUE_TEMPLATE/bug_report.md

@@ -59,3 +59,7 @@ cuDNN version: No CUDA
 
 ### Additional context
 <!-- Add any other context about the problem here. -->
+
+
+PS
+- [x] I know, that I could [join Catalyst slack (#__questions channel)](https://join.slack.com/t/catalyst-team-core/shared_invite/zt-d9miirnn-z86oKDzFMKlMG4fgFdZafw) for issue discussion.

.github/ISSUE_TEMPLATE/documentation.md

@@ -16,3 +16,7 @@ For typos and documentation fixes, please go ahead and:
 3. Submit a PR.
 
 Thank you!
+
+
+PS
+- [x] I know, that I could [join Catalyst slack (#__questions channel)](https://join.slack.com/t/catalyst-team-core/shared_invite/zt-d9miirnn-z86oKDzFMKlMG4fgFdZafw) for issue discussion.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -25,3 +25,7 @@ assignees: Scitator, bagxi, Ditwoo
 
 ### Additional context
 <!-- Add any other context or screenshots about the feature request here. -->
+
+
+PS
+- [x] I know, that I could [join Catalyst slack (#__questions channel)](https://join.slack.com/t/catalyst-team-core/shared_invite/zt-d9miirnn-z86oKDzFMKlMG4fgFdZafw) for issue discussion.

.github/ISSUE_TEMPLATE/question.md

@@ -52,3 +52,7 @@ cuDNN version: No CUDA
 
 ### Additional context
 <!-- Add any other context about the problem here. -->
+
+
+PS
+- [x] I know, that I could [join Catalyst slack (#__questions channel)](https://join.slack.com/t/catalyst-team-core/shared_invite/zt-d9miirnn-z86oKDzFMKlMG4fgFdZafw) for issue discussion.

.github/PULL_REQUEST_TEMPLATE.md

@@ -39,4 +39,8 @@
 Anyone in the community is free to review the PR once the tests have passed.
 If we didn't discuss your PR in Github issues there's a high chance it will not be merged.
 
-<!-- Thank you for your contribution! -->
+<!-- Thank you for your contribution! -->
+
+
+PS
+- [x] I know, that I could [join slack](https://join.slack.com/t/catalyst-team-core/shared_invite/zt-d9miirnn-z86oKDzFMKlMG4fgFdZafw) for pull request discussion.

.github/workflows/greetings.yml

@@ -9,5 +9,5 @@ jobs:
     - uses: actions/first-interaction@v1
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
-        issue-message: 'Hi! Thank you for your contribution! Great first issue!'
-        pr-message: 'Hey thanks for the pull request! Please give us a bit of time to review it!'
+        issue-message: 'Hi! Thank you for your contribution! Great first issue! Please [join our slack](https://join.slack.com/t/catalyst-team-core/shared_invite/zt-d9miirnn-z86oKDzFMKlMG4fgFdZafw) for issue discussion (#__questions channel).'
+        pr-message: 'Hey thanks for the pull request! Please [join our slack](https://join.slack.com/t/catalyst-team-core/shared_invite/zt-d9miirnn-z86oKDzFMKlMG4fgFdZafw) for pull request discussion (#__questions channel).'

CHANGELOG.md

@@ -13,11 +13,12 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Changed
 
-- 
+- update Catalyst version to `20.10.1` for tutorials ([#967](https://github.com/catalyst-team/catalyst/pull/967))
+- added link to dl-course ([#967](https://github.com/catalyst-team/catalyst/pull/967))
 
 ### Removed
 
-- 
+- several deprecated tutorials ([#967](https://github.com/catalyst-team/catalyst/pull/967))
 
 ### Fixed
 

README.md

@@ -108,14 +108,16 @@ traced_model = runner.trace(loader=loaders["valid"])
 
 ### Step by step guide
 1. Start with [Catalyst 101 — Accelerated PyTorch](https://medium.com/pytorch/catalyst-101-accelerated-pytorch-bd766a556d92?source=friends_link&sk=d3dd9b2b23500eca046361187b4619ff) introduction.
-2. Check [minimal examples](#minimal-examples).
-3. Try [notebook tutorials with Google Colab](#tutorials).
-4. Read [blogposts](#blogposts) with use-cases and guides (and Config API intro).
-5. Go through advanced  [classification](https://github.com/catalyst-team/classification), [detection](https://github.com/catalyst-team/detection) and [segmentation](https://github.com/catalyst-team/segmentation) pipelines with Config API. More pipelines available under [projects section](#projects). 
-6. Want more? See [Alchemy](https://github.com/catalyst-team/alchemy) and [Reaction](https://github.com/catalyst-team/reaction) packages.
-7. For Catalyst.RL introduction, please follow [Catalyst.RL repo](https://github.com/catalyst-team/catalyst-rl).
-8. If you would like to contribute to the project, follow our [contribution guidelines](https://github.com/catalyst-team/catalyst/blob/master/CONTRIBUTING.md). 
-If you want to support the project, feel free to donate on [patreon page](https://patreon.com/catalyst_team) or [write us]((#user-feedback)) with your proposals.
+1. Check [minimal examples](#minimal-examples).
+1. Try [notebook tutorials with Google Colab](#tutorials).
+1. Read [blogposts](#blogposts) with use-cases and guides.
+1. Learn machine learning with our ["Deep Learning with Catalyst" course](https://github.com/catalyst-team/dl-course).
+1. Or go directly to advanced  [classification](https://github.com/catalyst-team/classification), [detection](https://github.com/catalyst-team/detection) or [segmentation](https://github.com/catalyst-team/segmentation) pipelines with Config API. 
+1. Want more? See [Alchemy](https://github.com/catalyst-team/alchemy) and [Reaction](https://github.com/catalyst-team/reaction) packages.
+1. RL fan? Please follow [Catalyst.RL repo](https://github.com/catalyst-team/catalyst-rl).
+1. If you would like to contribute to the project, follow our [contribution guidelines](https://github.com/catalyst-team/catalyst/blob/master/CONTRIBUTING.md). 
+1. If you want to support the project, feel free to donate on [patreon page](https://patreon.com/catalyst_team) or [write us]((#user-feedback)) with your proposals.
+1. **Finally, do not forget to [join our slack](https://join.slack.com/t/catalyst-team-core/shared_invite/zt-d9miirnn-z86oKDzFMKlMG4fgFdZafw) for collaboration**.
 
 
 ## Table of Contents