Enhance README and refactor code structure for improved functionality

- Updated README.md with detailed project description, features, and installation instructions.
- Refactored functions.php to include configuration settings and improved database handling.
- Modified index.php for better user experience and added pagination controls.
- Introduced new utility functions for API handling and database interactions.
- Added CSS styles for improved layout and visibility of elements.
- Removed vault.csv as data is now managed through the database.
- Implemented FTP deployment workflow for automated deployment.
- Added exception handling classes for better error management.
- Created JavaScript functions for pagination of transaction records.

style.css

@@ -10,22 +10,18 @@ body {
   padding: 0 1em;
 }
 
-.grid {
-  display: grid;
-  grid-template-columns: repeat(2, 1fr);
-  grid-template-rows: 1fr;
-  grid-column-gap: 4em;
-  grid-row-gap: 0px;
+table {
+  color: #000;
+  visibility: hidden;
+  width: 100%;
 }
 
-table { color: #000; width: 100%; }
-
-table, tr, td {
+table, tr, td, th {
   border: 1px solid #333;
   border-collapse: collapse;
 }
 
-thead td {
+thead th {
   background: #ccc;
   color: #000;
   font-weight: bold;
@@ -40,10 +36,25 @@ tr.credit { background-color: var(--green); color: #fff; }
 
 td { padding: .15em 1em; }
 
-h1 {  }
+#pagination-controls {
+  align-items: center;
+  display: flex;
+  justify-content: center;
+  gap: 1em;
+  margin: 1em 0;
+}
 
-.vault h2, h3, h4 { margin: 0; }
+h2, h3, h4 { margin: 0; }
+
+.grid {
+  display: grid;
+  grid-template-columns: repeat(2, 1fr);
+  grid-template-rows: 1fr;
+  grid-column-gap: 4em;
+  grid-row-gap: 0px;
+  margin-top: .5em;
+}
+
+.vault { margin: 0 0 3em; }
 
 .vault h3, h4 { font-style: italic; }
-
-.vault { margin: 0 0 1em; }