Docs: How-to landing and organization

[erinecon]

Applicable spec: ISD-3048

Overview

Add structure to the WordPress charm how-to guides.

Rationale

Presently, the WordPress charm contains 13 separate how-to guides. This number justifies the establishment of a coherent structure to the guides.

The change is manifested in two ways:

1. Added a landing page, how-to/index.md, that establishes an order and attempts to tell a coherent story.
2. Reordered the how-to guides in the overview navigation table so the sidebar on Charmhub will tell the same story.

Juju Events Changes

None

Module Changes

None

Library Changes

None

Checklist

• The charm style guide was applied
• The contributing guide was applied
• The changes are compliant with ISD054 - Managing Charm Complexity
• The documentation is generated using src-docs
• The documentation for charmhub is updated.
• The PR is tagged with appropriate label (urgent, trivial, complex)

The documentation on Charmhub will be updated once the PR is approved.

[github-actions]

Test results for commit a7985e1

Test coverage for a7985e1

Name                Stmts   Miss Branch BrPart  Cover   Missing
---------------------------------------------------------------
src/charm.py          576     39    178     35    90%   163, 205-208, 300->303, 415, 474->478, 628, 659, 665, 682-686, 716, 751-752, 812, 821, 888, 930-932, 964->977, 976, 978, 983-984, 1044, 1064, 1071, 1161, 1170, 1182, 1203, 1212, 1231, 1235, 1264, 1305, 1437, 1459, 1466->1468, 1511->exit, 1523, 1533, 1571
src/cos.py             20      0      0      0   100%
src/exceptions.py      16      1      2      1    89%   41
src/state.py           33      0      2      0   100%
src/types_.py          15      0      0      0   100%
---------------------------------------------------------------
TOTAL                 660     40    182     36    91%

Static code analysis report

Run started:2025-03-10 12:11:22.216074

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 4721
  Total lines skipped (#nosec): 1
  Total potential issues skipped due to specifically being disabled (e.g., #nosec BXXX): 0

Run metrics:
  Total issues (by severity):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
  Total issues (by confidence):
  	Undefined: 0
  	Low: 0
  	Medium: 0
  	High: 0
Files skipped (0):