Merge branch 'master' into quanta

* master: (326 commits)
  Make URL a literal string to fix broken link (#4667)
  Move developer guidelines to contributing #4665 (#4666)
  Update Volto contributing to align with and refer to the new Plone co… (#4634)
  Release @plone/scripts 3.0.0
  Changelog
  Added querystring search get option (#4658)
  Add current page parameter to the route in the listing and search block pagination (#4159)
  Fixed wrong localization on password reset page(#4656) (#4657)
  Release notes for 16.19.0 (#4655)
  Razzle upgrade notice in upgrade guide (#4641)
  Release generate-volto 7.0.0-alpha.3
  Update to latest Razzle - needed since #3997. This fixes the duplicated Razzles issue (#4640)
  3092 improve spellcheck (#4633)
  developer process for first time contributing (#4617)
  Trigger CI on pull_request event (#4629)
  Pining of `pydata-sphinx-theme` and `sphinx-book-theme`, CI is complaining. (#4626)
  Set sameSite in `18N_LANGUAGE` cookie (#4627)
  Update simple-git (#4546)
  DefaultView (blocks disabled): Show field name as tip on hover of label (#4598)
  Fix regexp that checks valid URLs and improve tests (#4601)
  ...

.github/ISSUE_TEMPLATE/PLIP.md

@@ -0,0 +1,64 @@
+---
+name: "\U0001F680 PLIP"
+about: Plone Improvement Proposal
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## PLIP (Plone Improvement Proposal)
+
+<!--
+
+Read http://5.docs.plone.org/develop/coredev/docs/plips.html first!
+
+Set "03 type: feature: plip" as label.
+
+Mention the @plone/volto-team when the PLIP is information complete!
+
+-->
+
+## Responsible Persons
+
+### Proposer: <!-- full NAME of the proposer, should lead the PLIP - if not possible, tell about it! -->
+
+### Seconder: <!-- NAME of another person supporting this PLIP -->
+
+## Abstract
+
+<!-- a comprehensive overview of the subject -->
+
+## Motivation
+
+<!--
+Reason or motivation this proposal was created
+-->
+
+## Assumptions
+
+<!-- Preconditions -->
+
+## Proposal & Implementation
+
+<!--
+Detailed proposal with implementation details and - if needed - possible variants to be discussed.
+-->
+
+## Deliverables
+
+<!--
+Packages and documentation chapters involved, includes also third party if needed.
+-->
+
+## Risks
+
+<!--
+What will break/ affect existing installations of Plone after upgrade, including end user point of view, training efforts etc.
+-->
+
+## Participants
+
+<!--
+list of persons and roles known
+-->