Format the issuers table

[wallrj]

While reviewing #1382 I wanted to help the author move their new issuer to the right place in the table, but the markdown table is currently unaligned and difficult to read in the GitHub preview, so here I'm trying to fix that problem first.

• https://github.com/cert-manager/website/blob/master/content/docs/configuration/issuers.md

vs

• https://github.com/cert-manager/website/blob/3c913f668cc3dde1f9cca66540fde62f427a744f/content/docs/configuration/issuers.md

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[maelvls]

/lgtm /approve

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