refactor: remove search_surfsense_docs tool and related references

- Deleted the `search_surfsense_docs` tool and its associated files, streamlining the agent's toolset.
- Updated various components and prompts to remove references to the now-removed tool, ensuring consistency across the codebase.
- Adjusted documentation to direct users to the SurfSense documentation link for product-related queries instead.

surfsense_backend/app/agents/new_chat/skills/builtin/email-drafting/SKILL.md

@@ -1,7 +1,6 @@
 ---
 name: email-drafting
 description: Draft an email matching the user's voice, with structured intent and CTA
-allowed-tools: search_surfsense_docs
 ---
 
 # Email drafting

surfsense_backend/app/agents/new_chat/skills/builtin/kb-research/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: kb-research
 description: Structured approach to finding and synthesizing information from the user's knowledge base
-allowed-tools: search_surfsense_docs, scrape_webpage, read_file, ls_tree, grep, web_search
+allowed-tools: scrape_webpage, read_file, ls_tree, grep, web_search
 ---
 
 # Knowledge-base research

surfsense_backend/app/agents/new_chat/skills/builtin/meeting-prep/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: meeting-prep
 description: Pull together briefing materials before a scheduled meeting
-allowed-tools: search_surfsense_docs, web_search, scrape_webpage, read_file
+allowed-tools: web_search, scrape_webpage, read_file
 ---
 
 # Meeting preparation

surfsense_backend/app/agents/new_chat/skills/builtin/report-writing/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: report-writing
 description: How to scope, draft, and revise a Markdown report artifact via generate_report
-allowed-tools: generate_report, search_surfsense_docs, read_file
+allowed-tools: generate_report, read_file
 ---
 
 # Report writing

surfsense_backend/app/agents/new_chat/skills/builtin/slack-summary/SKILL.md

@@ -1,7 +1,6 @@
 ---
 name: slack-summary
 description: Distill a Slack channel or thread into actionable summary
-allowed-tools: search_surfsense_docs
 ---
 
 # Slack summarization