Add relay count tracking workflow with dual charts

This commit adds:
- New GitHub workflow to track relay counts
- Two charts: BitChat-compatible relays and total functioning relays
- Extended history for both charts (70 days)
- Project structure improvements with scripts and assets directories
- Updated documentation in README.md and other files
- Dependencies in requirements.txt

scripts/README.md

@@ -0,0 +1,25 @@
+# Georelays Scripts
+
+This directory contains utility scripts for the Georelays project:
+
+## track_relay_counts.py
+
+This script analyzes the git history of the `nostr_relays.csv` file to track how the number of relay entries changes over time. 
+
+### Features:
+- Retrieves the last 30 commits that modified the relay CSV file
+- Counts the number of relay entries in each commit
+- Creates a time series chart showing the trend of relay counts
+- Saves the chart as `assets/relay_count_chart.png`
+
+### Usage:
+```
+python scripts/track_relay_counts.py
+```
+
+### Dependencies:
+- pandas
+- matplotlib
+- numpy
+
+This script is automatically run by the GitHub workflow after each update to the relay data.