WIP: Add Performing Daily Operations with ColdFront

[susan-pgedge]

Summary

• Adds a new page, "Performing Daily Operations with ColdFront"
  (docs/maintaining_coldfront.md), covering the full lifecycle of a
  deployment: getting it running (pointer to Installing and
  Configuring ColdFront), using the three table modes day to day,
  scheduling the archiver/partitioner/compactor cron jobs, and
  ongoing operational upkeep (access grants, Lakekeeper's encryption
  key, mesh/bakery health, vended credentials).
• Added to the nav right after "Installing and Configuring ColdFront".

This is a work in progress: the "Getting ColdFront Running"
section is complete (it just points at the existing install/configure
guide), but the other three sections are currently a bullet-point
outline to be expanded into full content in follow-up commits.

Test plan

• mkdocs build --strict passes locally

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[codacy-production]

Up to standards ✅

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[vyruss]

I don't find this paragraph relevant at all in this spot, and the mention of RETURNING is confusing.

[susan-pgedge]

What you see here is just an early draft - I told Claude to (based on your content) provide an outline/reference for the steps that a user will need to perform on a day to day basis to use ColdFront. Your usage guide is action packed, but too hard to wade through on a daily basis - we might want to break the sections apart even, into other pages for ease of use and maintenance.