Docs changes for 0.36.0 release (#2494)

* Preparing docs for 1.0.0-rc.1 relese

* Update docs/UPGRADING.md

Co-authored-by: Umberto Baldi <[email protected]>

* revert, we are releasing 0.36.0

---------

Co-authored-by: Umberto Baldi <[email protected]>
Co-authored-by: Umberto Baldi <[email protected]>

Author: cmaglie

Diff for: README.md

@@ -33,9 +33,9 @@ contribute your changes to the project.
 
 :sparkles: Thanks to all our [contributors]! :sparkles:
 
-### Beta testing
+### Testing builds
 
-[Nightly builds] are available for beta testing.
+[Nightly builds] are available for testing.
 
 ## Security
 

Diff for: docs/CONTRIBUTING.md

@@ -8,9 +8,9 @@ There are several ways you can get involved:
 | ------------------------------------------------- | ------------------------------------------------------- |
 | - Support request<br/>- Question<br/>- Discussion | Post on the [Arduino Forum][forum]                      |
 | - Bug report<br/>- Feature request                | Issue report (read the [issue guidelines][issues])      |
-| Beta testing                                      | Try out the [nightly build][nightly]                    |
+| Testing                                           | Try out the [nightly build][nightly]                    |
 | - Bug fix<br/>- Enhancement                       | Pull Request (read the [pull request guidelines][prs])  |
-| Translations for Arduino CLI                      | [transifex][translate]                                  |
+| Translations for Arduino CLI                      | Use the [transifex][translate] platform                 |
 | Monetary                                          | - [Donate][donate]<br/>- [Buy official products][store] |
 
 ## Issue Reports

Diff for: docs/installation.md

@@ -79,10 +79,6 @@ in your [`PATH`](https://en.wikipedia.org/wiki/PATH%5F%28variable%29) or add the
 [macos64]: https://downloads.arduino.cc/arduino-cli/arduino-cli_latest_macOS_64bit.tar.gz
 [macosarm64]: https://downloads.arduino.cc/arduino-cli/arduino-cli_latest_macOS_ARM64.tar.gz
 
-> **Deprecation notice**: links in the form
-> `http://downloads.arduino.cc/arduino-cli/arduino-cli-latest-<platform>.tar.bz2` won’t be further updated. That URL
-> will provide the version `0.3.7-alpha.preview`, regardless of further releases.
-
 ### Previous versions
 
 These are available from the "Assets" sections on the [releases page](https://github.com/arduino/arduino-cli/releases).