update provider name in documentation to linode-linode

[eljohnson92]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Based on feedback on kubernetes-sigs/cluster-api#10471 this changes our documentation to use linode-linode instead of akamai-linode. it also separates out the naming for locally built manifest files into local-linode though I would be open to keeping this the same as linode-linode
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

TODOs:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.21%. Comparing base (1a10bbb) to head (7804b2f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #287   +/-   ##
=======================================
  Coverage   54.21%   54.21%           
=======================================
  Files          27       27           
  Lines        1577     1577           
=======================================
  Hits          855      855           
  Misses        671      671           
  Partials       51       51           

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