Tweaks and fixes throughout the project (#27)

This PR contains the work done to do a little bit of housekeeping pass across all packages and the Website service.

To provide further details about the work:
* Refreshed the READMEs and source documentation to match the current code;
* Tagged every test case consistently across the Infrastructure, Localization, Persistence, and Website test targets;
* Removed Website middleware tests now covered by Infrastructure's own suite;
* Conformed the `PrepareDB` method to Sendable;
* Relaxes the production Compose DATABASE_TLS default from require to prefer;
* Added Persistence test verifying the prefer posture falls back to plaintext connections.

Reviewed-on: rock-n-code/loud-amsterdam#27
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Services/Website/Tests/Library/Cases/Internal/Enumerations/StaticFileTests.swift

@@ -3,7 +3,10 @@ import Testing
 
 @testable import WebsiteLibrary
 
-@Suite("StaticFile enumeration")
+@Suite(
+    "StaticFile enumeration",
+    .tags(.enumeration)
+)
 struct StaticFileTests {
 
     // MARK: Type aliases

Services/Website/Tests/Library/Cases/Internal/Pages/ErrorPageTests.swift

@@ -4,7 +4,10 @@ import Testing
 
 @testable import WebsiteLibrary
 
-@Suite("ErrorPage page", .tags(.page))
+@Suite(
+    "ErrorPage page",
+    .tags(.page)
+)
 struct ErrorPageTests {
     
     // MARK: Functional tests

Services/Website/Tests/Library/Cases/Internal/Pages/IndexPageTests.swift

@@ -4,7 +4,10 @@ import Testing
 
 @testable import WebsiteLibrary
 
-@Suite("IndexPage page", .tags(.page))
+@Suite(
+    "IndexPage page",
+    .tags(.page)
+)
 struct IndexPageTests {
     
     // MARK: Functional tests