Update docs

[erinecon]

Overview

Small changes to the documentation that are specific to the jenkins-k8s charm.

Rationale

• Index: Fixed outdated links
• Tutorial: Fixed outdated commands, removed broken links, capitalised Juju and MicroK8s where appropriate, grammatical changes
• How-to guides: Fixed outdated commands, updated links, grammatical changes, fixed headers and capitalisation
• Reference: Grammatical changes

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)

[github-actions]

Test coverage for 6dd3551

Name                Stmts   Miss Branch BrPart  Cover   Missing
---------------------------------------------------------------
src/actions.py         29      0      4      0   100%
src/agent.py          119      0     20      0   100%
src/auth_proxy.py      52      0      8      0   100%
src/charm.py           89      0     14      0   100%
src/cos.py             20      0      0      0   100%
src/ingress.py         16      0      4      0   100%
src/jenkins.py        376      0     60      0   100%
src/pebble.py          25      0      2      0   100%
src/state.py          109      0     24      0   100%
src/timerange.py       30      0      6      0   100%
---------------------------------------------------------------
TOTAL                 865      0    142      0   100%

Static code analysis report

Run started:2024-09-06 18:21:25.767799

Test results:
  No issues identified.

Code scanned:
  Total lines of code: 7508
  Total lines skipped (#nosec): 6
  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):

[yanksyoon]

LGTM!