Make contributing guide more accessible.

[Carlton Gibson]

Django was accepted onto ​Google's Season of Docs for 2020.

Gabby Precious was accepted for a project to help make the contributing guide more accessible.

This is a reference ticket for that.

[Carlton Gibson <carlton@…>]

In e733c9a:

Refs #32412 -- Adjusted beginning of Advice for new contributors.

With the goal of guiding folks to the right destination:

• Improved wording of tutorial call-out.
• Added summary of page purpose.
• Added link to Writing code reference doc.

[Carlton Gibson <carlton@…>]

In aa29c57:

Refs #32412 -- Adjusted link from tutorial to reference docs.

The writing code index page is a better location for a newer contributor to
land, than the specific patch guidelines subpage.

[Carlton Gibson <carlton.gibson@…>]

In bbd1b356:

[3.2.x] Refs #32412 -- Adjusted beginning of Advice for new contributors.

With the goal of guiding folks to the right destination:

• Improved wording of tutorial call-out.
• Added summary of page purpose.
• Added link to Writing code reference doc.

Backport of e733c9ac1746cedc78efabff340379f1c9ee47da from master

[Carlton Gibson <carlton.gibson@…>]

In cb680b68:

[3.2.x] Refs #32412 -- Adjusted link from tutorial to reference docs.

The writing code index page is a better location for a newer contributor to
land, than the specific patch guidelines subpage.

Backport of aa29c57beea7e8e570f8a597ea806ca3e2b3431d from master

[Carlton Gibson <carlton.gibson@…>]

In fdeca77:

[3.1.x] Refs #32412 -- Adjusted beginning of Advice for new contributors.

With the goal of guiding folks to the right destination:

• Improved wording of tutorial call-out.
• Added summary of page purpose.
• Added link to Writing code reference doc.

Backport of e733c9ac1746cedc78efabff340379f1c9ee47da from master

[Carlton Gibson <carlton.gibson@…>]

In 526a6f0d:

[3.1.x] Refs #32412 -- Adjusted link from tutorial to reference docs.

The writing code index page is a better location for a newer contributor to
land, than the specific patch guidelines subpage.

Backport of aa29c57beea7e8e570f8a597ea806ca3e2b3431d from master

[Claude Paroz]

It's nice to see improvements! However, unless this fixes errors, could we refrain from backporting to 3.1.x, as each change will require translators to work on new translations for the stable docs. What's already committed is fine, of course.

[Carlton Gibson]

Ok thanks Claude. Further changes only for 3.2.

[Carlton Gibson <carlton@…>]

In ead9085f:

Refs #32412 -- Adjusted Contributing Guide start page.

• Added headers emphasising Work on the framework vs Join the community sections, to raise the visibility of the community section.
• Added callouts to three main code/docs/translations areas, linking to respective start pages.
• Moved some Writing code specific content from the start page to the Writing code index. This clarifies the start page and adds content to the previously empty Writing code index.

Co-authored-by: Carlton Gibson <carlton.gibson@…>

[Carlton Gibson <carlton.gibson@…>]

In cafabd08:

[3.2.x] Refs #32412 -- Adjusted Contributing Guide start page.

• Added headers emphasising Work on the framework vs Join the community sections, to raise the visibility of the community section.
• Added callouts to three main code/docs/translations areas, linking to respective start pages.
• Moved some Writing code specific content from the start page to the Writing code index. This clarifies the start page and adds content to the previously empty Writing code index.

Co-authored-by: Carlton Gibson <carlton.gibson@…>

Backport of ead9085f0872d5c1c670502df6dc0f69b422eaad from master