docs: OIDC and ConnectionlessOffer examples

[curtis-h]

Description:

Adding docs for recent features plus minor fix.

• fix error in demo app when sending test message

Docs

• Add Connectionless Offer example
• fix typos in Connection Presentation example
• Add OIDC example
• update index links
• update sidebar

Checklist:

• My PR follows the contribution guidelines of this project
• My PR is free of third-party dependencies that don't comply with the Allowlist
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked the PR title to follow the conventional commit specification

[github-actions]

Lines	Statements	Branches	Functions
	76.29% (3541/4641)	66.4% (1544/2325)	79.98% (855/1069)

[coveralls]

Pull Request Test Coverage Report for Build 11180726710

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 72.788%

---

Totals
Change from base Build 11179742607:	0.0%
Covered Lines:	3434
Relevant Lines:	4514

---

💛 - Coveralls

[chereseeriepa]

Hello @curtis-h - i'm planning to contribute some updates to the connectionless docs soon.

@petevielhaber will you be giving this a review any time soon?