Rework crontab usage

[adriendupuis]

Question	Answer
JIRA Ticket
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• rebrand temporary file
• format

Checklist

• Text renders correctly
• Text has been checked with vale
• Description metadata is up to date
• Redirects cover removed/moved pages
• Code samples are working
• PHP code samples have been fixed with PHP CS fixer
• Added link to this PR in relevant JIRA ticket or code PR

[github-actions]

Preview of modified Markdown:

• docs/content_management/url_management/url_management.md
• docs/getting_started/install_ibexa_dxp.md

[adriendupuis]

The whole section could be rewrite. 2 suggestions:

• With a temporary file containing the whole crontab:

For example, to check links every week, the cronjob line looks like the following
where `[path-to-ibexa]` should be replaced with actual path to the installation directory:

```
0 0 * * 0 cd [path-to-ibexa]; php bin/console ibexa:check-urls --quiet --env=prod
```

Append the new cronjob line to user's crontab without destroying existing cronjob lines.
Assuming that the web server user data is `www-data`, it can be added this way:

```bash
crontab -u www-data -l > ibexa_cron.txt # backup existing cronjob list
echo '0 0 * * 0 cd [path-to-ibexa]; php bin/console ibexa:check-urls --quiet --env=prod' >> ibexa_cron.txt # Add cronjob line
crontab -u www-data - ibexa_cron.txt # replace with new cronjob list
rm ibexa_cron.txt # remove temporary file
```

• With a one liner

For example, to check links every week, the cronjob line looks like the following
where `[path-to-ibexa]` should be replaced with actual path to the installation directory:

```
0 0 * * 0 cd [path-to-ibexa]; php bin/console ibexa:check-urls --quiet --env=prod
```

Append the new cronjob line to user's crontab without destroying existing cronjob lines.
Assuming that the web server user data is `www-data`, it can be added this way:

```bash
(crontab -u www-data -l; echo '0 0 * * 0 cd [path-to-ibexa]; php bin/console ibexa:check-urls --quiet --env=prod') | crontab -u www-data -
```

[adriendupuis]

Side note: recent_activity.md doesn't explain how to add its cron job line