chore(ci): purge legacy docker-compose and certbot scripts, update cloud-init user to adam (#42)

### Summary of Changes

- **Legacy Cleanup**:
- Deleted `ci/deploy/` (`docker-compose.yml`, `.env.template`, `nginx/`)
  - Deleted `ci/scripts/deploy-certbot.sh`
  - Deleted `ci/scripts/deploy-new-tags.sh`
- **Cloud-Init Template Updates**:
  - Replaced username `debian` with `adam`
  - Removed deprecated `disable: - servicelb`
  - Cleaned up heredoc YAML formatting

ci/scripts/deploy-certbot.sh

@@ -1,42 +0,0 @@
-#!/bin/bash
-set -e
-
-# Usage: ./deploy-certbot.sh [domain1] [domain2] ...
-EMAIL="personal@ermnvldmr.com"
-CLOUDFLARE_INI="/etc/letsencrypt/cloudflare.ini"
-
-# Collect domains from arguments, fallback to default if none provided
-if [ $# -eq 0 ]; then
-    DOMAINS=("docs.ermnvldmr.com")
-else
-    DOMAINS=("$@")
-fi
-
-# Build domain arguments for certbot
-DOMAIN_ARGS=()
-for d in "${DOMAINS[@]}"; do
-    DOMAIN_ARGS+=("-d" "$d")
-done
-
-echo "Installing certbot and Cloudflare DNS plugin..."
-sudo apt-get update
-sudo apt-get install -y certbot python3-certbot-cloudflare
-
-if [ ! -f "$CLOUDFLARE_INI" ]; then
-    echo "Error: Cloudflare credentials file not found at $CLOUDFLARE_INI"
-    echo "Please ensure it exists and has 600 permissions."
-    exit 1
-fi
-
-echo "Requesting certificate for ${DOMAINS[*]} via Cloudflare DNS challenge..."
-sudo certbot certonly \
-  --dns-cloudflare \
-  --dns-cloudflare-credentials "$CLOUDFLARE_INI" \
-  "${DOMAIN_ARGS[@]}" \
-  --email "$EMAIL" \
-  --agree-tos \
-  --no-eff-email \
-  --non-interactive
-
-echo "Certificates for ${DOMAINS[*]} have been processed."
-

ci/scripts/deploy-new-tags.sh

@@ -1,47 +0,0 @@
-#!/bin/bash
-set -e
-
-# Setup paths relative to the script location
-DEPLOY_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../deploy" && pwd)"
-ENV_FILE="$DEPLOY_DIR/.env"
-TEMPLATE_FILE="$DEPLOY_DIR/.env.template"
-
-echo "Starting deployment for com-ermnvldmr..."
-
-# 1. Load existing .env values as defaults (do NOT overwrite environment variables)
-if [ -f "$ENV_FILE" ]; then
-    while IFS= read -r line || [ -n "$line" ]; do
-        # Skip comments and empty lines
-        [[ "$line" =~ ^# ]] || [[ -z "$line" ]] && continue
-        
-        key="${line%%=*}"
-        val="${line#*=}"
-        
-        # Only export if the variable is not already set in the environment
-        if [ -z "${!key}" ]; then
-            export "$key"="$val"
-        fi
-    done < "$ENV_FILE"
-fi
-
-# 2. Apply final fallback defaults
-export DOCS_TAG="${DOCS_TAG:-latest}"
-export WWW_TAG="${WWW_TAG:-latest}"
-
-# 3. Generate the .env file from template
-# Explicitly list variables to substitute to avoid messing with other values
-echo "Generating .env from template..."
-envsubst '$DOCS_TAG $WWW_TAG' < "$TEMPLATE_FILE" > "$ENV_FILE"
-
-# 4. Run Docker operations
-cd "$DEPLOY_DIR"
-echo "Pulling images..."
-docker compose pull
-
-echo "Starting containers..."
-docker compose up -d --remove-orphans
-
-echo "Pruning unused images..."
-docker image prune -f
-
-echo "Deployment complete."