#205: implement building link share dropdown

[achamor1]

Description

Implement link share dropdown on building pages to enable social media sharing

Reddit share example:

Bluesky share example:

Fixes # (issue)
#205

Testing Instructions

• docker compose up
• Navigate to localhost in web browser, select any individual building from the main page
• Click the share icon below building image
• dropdown will appear
• Example (WIP):

Please describe the tests/QA that you did to verify your changes. Provide instructions so we can reproduce.
Please also list any relevant details for your test configuration

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• If I added a large new feature, I added it to the release notes (ReleaseNotes.vue)

Data Update (if applicable):

• I have followed the Data Update Checklist for updating to new year's data

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