Update contributing docs with current practice

[rmartin16]

Changes

• Update contributing docs for current practice (mostly the dev process)
• Reflow (english) docs for 80 character width

PR Checklist:

• All new features have been tested
• All new features have been documented
• I have read the CONTRIBUTING.md file
• I will abide by the code of conduct

[rmartin16]

The primary goal of this PR was to update https://beeware.org/contributing/how/process/ so I can reference it in the implementation of beeware/.github#63.

I also went through the rest of the pages under contributing to make sure they weren't especially out of date; other than reflowing the text, I updated some punctuation, updated redirected links, and removed references to Travis and BeeKeeper.

[github-actions]

Visit the preview URL for this PR (updated for commit 51899e0):

https://beeware-org--pr551-contrib-8m8xy9bb.web.app

_{(expires Tue, 06 Feb 2024 00:59:11 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: b0da44bc067e7d9a4255c77cb2c5fce572218cec}

[freakboy3742]

On the whole, these all look like good (and badly needed) changes. I initially started with a pure review, but some of the changes needed to be a bit more substantive, so I've pushed some updates:

• Removed all references to DCOs. We're not using or enforcing them, and I'm not convinced they're actually needed.
• Replaced the references to virtualenv with venv
• Expanded the section on change notes to provide a practical example
• Added a section on translating the tutorial.

Marking as approved from my perspective; if you spot any typos or inconsistencies in what I've pushed, let me know. Otherwise, I'm happy to have this land as is.

[rmartin16]

I restored the translations template because the wording above says "select a language below" but this template is necessary to have that list.

That said, the ordering of the page is a little wonky now since this language listing appears after the section about translating the tutorial.

I don't think this is too bad....but I don't know how to make it appear any better in this system. Sooo, I think I'll toss it back to you to address this further or merge as is.

[freakboy3742]

This removal was actually deliberate - the translations template only serves to add the list of translated languages to the body of the text. In the previous version, the body ended with a "We have translations for:" line, which flowed into this extra content; but with the new body content, it makes less sense.

I've removed the template from the translated versions of this page as well; so - we either need to restore it to all versions, or delete it everywhere and delete the template entirely.

[rmartin16]

I see. Are these translations discoverable at all without those links from the translations template?

I updated the wording....but it's just a strange instruction to "find the page in the language" you want to update...

[rmartin16]

ahh...there's a globe next to the Edit button.

[freakboy3742]

Yes - there's a pulldown at the top of the page (the globe icon) that lets you select one of the existing translations.

[rmartin16]

Ok; Updated the instructions to use the globe to choose a language prior to clicking edit.

[freakboy3742]

Looks good to me! Thanks for prodding this forward!