vela: add page

[CrystalSpore]

• The page (if new), does not already exist in the repo.
• The page is in the correct platform directory (common/, linux/, etc.)
• The page has 8 or fewer examples.
• The PR title conforms to the recommended templates.
• The page follows the content guidelines.
• The page description includes a link to documentation or a homepage (if applicable).

Note: Vela is a new-ish tool, but is being used an enterprise levels. The example command is the simplest format of the vela command that I have used so far to do a deploy, which is why it is the first & only example so far. The vela tool can be used for other purposes, which should eventually be put earlier, but I have not used them in my day to day.

Cheers

[CLAassistant]

All committers have signed the CLA.

[tldr-bot]

The build for this PR failed with the following error(s):

pages/common/vela.md:3: TLDR004 Command descriptions should end in a period
pages/common/vela.md:6: TLDR005 Example descriptions should end in a colon with no trailing characters

Please fix the error(s) and push again.

[tldr-bot]

The build for this PR failed with the following error(s):

pages/common/vela.md:3: TLDR004 Command descriptions should end in a period

Please fix the error(s) and push again.

[sbrl]

Thanks for the new page! I've left some comments below for you to review.

[sbrl]

Thanks, @CrystalSpore!