Merge pull request #620 from per1234/remove-donation-links

Remove donation links from contributor guide

Author: per1234

docs/CONTRIBUTING.md

@@ -6,18 +6,16 @@ Thanks for your interest in contributing to this project!
 
 There are several ways you can get involved:
 
-| Type of contribution                       | Contribution method                                                              |
-| ------------------------------------------ | -------------------------------------------------------------------------------- |
-| - Support<br/>- Question<br/>- Discussion  | Post on the [**Arduino Forum**][forum]                                           |
-| - Defect report<br/>- Enhancement proposal | Issue report (see the guide [**here**][issues])                                  |
-| - Correction<br/>- Enhancement             | Pull request (see the guide [**here**][prs])                                     |
-| Monetary                                   | - [Donate][donate]<br/>- [Sponsor][sponsor]<br/>- [Buy official products][store] |
+| Type of contribution                       | Contribution method                             |
+| ------------------------------------------ | ----------------------------------------------- |
+| - Support<br/>- Question<br/>- Discussion  | Post on the [**Arduino Forum**][forum]          |
+| - Defect report<br/>- Enhancement proposal | Issue report (see the guide [**here**][issues]) |
+| - Correction<br/>- Enhancement             | Pull request (see the guide [**here**][prs])    |
+| Monetary                                   | [Buy official products][store]                  |
 
 [forum]: https://forum.arduino.cc
 [issues]: contributor-guide/issues.md#issue-report-guide
 [prs]: contributor-guide/pull-requests.md#pull-request-guide
-[donate]: https://www.arduino.cc/en/donate/
-[sponsor]: https://github.com/sponsors/arduino
 [store]: https://store.arduino.cc
 
 ## Resources