Updates to secure signals example pages

[ssundahlTTD]

• rename server-only to server-side to be more accurate
• correctly link to client-side integration example for client-server sample page
• ensure links to source are correct (they will be when deployed)
• change titles to more correctly describe the type of sample
• clean up wording

[ashleysmithTTD]

Just checking - these changes have client-server and client-side - is this expected?

[ssundahlTTD]

It's a good question. I think so. The link calls out the client-side integration example but the overall example is client-server since the server is generating the token but the client is initializing the sdk with the identity from the server.

[sunnywu]

i dont think this is correct -

short answer:
it should be referring to Client-Server Integration and better to link to this instead as a quick fix:
https://unifiedid.com/docs/guides/integration-javascript-client-server

long answer:
We should add a Client-Server Integration option section in GAM Secure Signals instead of linking to SDK for JavaScript Client-Side Integration

So in GAM Secure Signal page, we should mention 3 integration methods - Server-Side, Client-Server and Client-Side. cc @genwhittTTD on this but probably it is best to talk thru between Gen/Scott/Me after new year.