Copy update: [WD-16878] Update /secure-open-source and Meganav

[Kxiru]

Done

• /solutions/secure-open-source (Now /solutions/open-source-security) according to copydoc.
• /solutions/ai/infrastructure edits to ensure consistency of links and terminology.
• Meganav edits according to copydoc
• Form file rename to maintain consistency in directory path change and phrasing.

Task link: https://warthogs.atlassian.net/browse/WD-16878?atlOrigin=eyJpIjoiNGI0NzM1NmEyMzA1NGRkODk2ZDg1YTk4NjJiMGJlODUiLCJwIjoiaiJ9

Copy Doc link: https://docs.google.com/document/d/1mrvhkrVjCCJE39h96CPG_b_ZHWVN0GHzZ_6TdoudeYs/edit?tab=t.0

Meganav Copy Doc link: https://docs.google.com/document/d/1Y0dxbuar0UAPSCfILtP7fsEX-83yDh7Ha637FA9Wbik/edit?disco=AAABYZ9jdNU

QA Page Link (ai/infrastructure): https://docs.google.com/document/d/1AtAApqxX9cbWf4a3cakEYbk7OoTfdBBi7FlA3WZz5ZM/edit

QA Page link:

QA

• Check out this feature branch
• Run the site using the command ./run serve
• View the site locally in your web browser at: http://0.0.0.0:8002/
• Run through the following QA steps ---> Verify Redirect link works ---> Verify that previous links have been amended. See QA Page link.

Issue / Card

Fixes urgent copydoc issues.

Screenshots

N/A

[webteam-app]

Demo

Jenkins

demos.haus

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.82%. Comparing base (d0dae39) to head (0d32032). Report is 63 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1426 +/- ## ========================================== + Coverage 69.73% 69.82% +0.09% ========================================== Files 15 15 Lines 1229 1233 +4 ========================================== + Hits 857 861 +4 Misses 372 372 ``` | [Flag](https://app.codecov.io/gh/canonical/canonical.com/pull/1426/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=canonical) | Coverage Δ | | |---|---|---| | [python](https://app.codecov.io/gh/canonical/canonical.com/pull/1426/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=canonical) | `69.82% <ø> (+0.09%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=canonical#carryforward-flags-in-the-pull-request-comment) to find out more.

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