docs: improve shareable configs

[HonkingGoose]

Changes:

• Some small textual fixes
• Migrate large section into 2 separate tables
• Simplify examples by only using 1 parameter instead of 2 (this also shrinks the table width)
• Add table with GitHub/GitLab configuration examples

Context:

I think putting this information into 2 separate tables is way way clearer.
Let me know what you think of this format.

I also want some feedback on how to further shrink the table width as the names column is making the tables really long.
We don't want the table to be too big, as this will be hard to review in future PRs that change the table... 😄

Helps with issue #7626.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added unit tests, or
• Unit tests + ran on a real repository

[rarkins]

We should modify this page to mention that we recommend git-based presets instead of npm, too.

[HonkingGoose]

The "new" text was copy/pasted from https://docs.renovatebot.com/config-presets/

The new table is based on the https://docs.renovatebot.com/config-presets/#preset-hosting content.

[renovate-release]

🎉 This PR is included in version 23.84.14 🎉

The release is available on:

• GitHub release
• 23.84.14

Your semantic-release bot 📦🚀